# e constant

e constant or Euler's number is a mathematical constant. The e constant is real and irrational number.

e = 2.718281828459...

## Definition of e

The e constant is defined as the limit:

#### Alternative definitions

The e constant is defined as the limit:

The e constant is defined as the infinite series:

## Properties of e

#### Reciprocal of e

The reciprocal of e is the limit:

#### Derivatives of e

The derivative of the exponential function is the exponential function:

(e x)' = ex

The derivative of the natural logarithm function is the reciprocal function:

(loge x)' = (ln x)' = 1/x

#### Integrals of e

The indefinite integral of the exponential function ex is the exponential function ex.

ex dx = ex+c

The indefinite integral of the natural logarithm function loge x is:

∫ loge x dx = ∫ lnx dx = x ln x - x +c

The definite integral from 1 to e of the reciprocal function 1/x is 1:

## Base e logarithm

The natural logarithm of a number x is defined as the base e logarithm of x:

ln x = loge x

## Exponential function

The exponential function is defined as:

f (x) = exp(x) = ex

## Euler's formula

The complex number e has the identity:

e = cos(θ) + i sin(θ)

i is the imaginary unit (the square root of -1).

θ is any real number.

## Answers to Questions (FAQ)

### How to find a number in e?

Finding a number in e digits necessitates to browse all its decimals, there is no other mean. There are no mean to predict a number and its position in $e$.

Example: 8 is is position 3 and 5 (and many others)

For decoding the first decimal 7 in 2.71828 is in position 1. Some programs take the same position as 0 (some computers count from 0), others consider the position 2 (counting the number 2 before the decimal dot/point as the position 1).

### What are the names for e?

e is also called Euler's number or Napier's constant.

### How many digits are there in e decimals?

There are an infinite number of decimal places in the number e=2.71828... Supercomputers are continuing to find more. dCode knows the e decimals until 1000000 (one million digits of e).

Currently, we have around 1975 calculators, conversion tables and usefull online tools and software features for students, teaching and teachers, designers and simply for everyone.

You can find at this page financial calculators, mortgage calculators, calculators for loans, calculators for auto loan and lease calculators, interest calculators, payment calculators, retirement calculators, amortization calculators, investment calculators, inflation calculators, finance calculators, income tax calculators, compound interest calculators, salary calculator, interest rate calculator, sales tax calculator, fitness & health calculators, bmi calculator, calorie calculators, body fat calculator, bmr calculator, ideal weight calculator, pace calculator, pregnancy calculator, pregnancy conception calculator, due date calculator, math calculators, scientific calculator, fraction calculator, percentage calculators, random number generator, triangle calculator, standard deviation calculator, other calculators, age calculator, date calculator, time calculator, hours calculator, gpa calculator, grade calculator, concrete calculator, subnet calculator, password generator conversion calculator and many other tools and for text editing and formating, downloading videos from Facebok (we built one of the most famous Facebook video downloader online tools). We also provide you online downloanders for YouTube, Linkedin, Instagram, Twitter, Snapchat, TikTok and other social media sites (please note we does not host any videos on its servers. All videos that you download are downloaded from Facebook's, YouTube's, Linkedin's, Instagram's, Twitter's, Snapchat's, TikTok's CDNs. We also specialise on keyboard shortcuts, ALT codes for Mac, Windows and Linux and other usefull hints and tools (how to write emoji online etc.)

There are many very usefull online free tools and we would be happy if you share our page to others or send us any suggestions for other tools which will come on your mind. Also in case you find any of our tools that it does not work properly or need a better translation - please let us know. Our tools will make your life easier or simply help you to do your work or duties faster and in more effective way.

These below are the most commonly used by many users all over the world.

And we are still developing more. Our goal is to become the one-stop, go-to site for people who need to make quick calculations or who need to find quick answer for basic conversions.

Additionally, we believe the internet should be a source of free information. Therefore, all of our tools and services are completely free, with no registration required. We coded and developed each calculator individually and put each one through strict, comprehensive testing. However, please inform us if you notice even the slightest error – your input is extremely valuable to us. While most calculators on Justfreetools.com are designed to be universally applicable for worldwide usage, some are for specific countries only.

Page Id: 1526

This website uses cookies to improve your experience, analyze traffic and display ads. Learn more