# What is 39 factorial ?

Steps to calculate factorial of 39

## How to calculate the factorial of 39

To find 39 factorial, or 39!, simply use the formula that multiplies the number 39 by all positive whole numbers less than it.

Let's look at how to calculate the Factorial of Thirty-nine :

39! is exactly : 20397882081197443358640281739902897356800000000

Factorial of 39 can be calculated as:
39! = 39 x 38 x 37 x 36 x ... x 3 x 2 x 1

The number of trailing zeros in 39! is 9

The number of digits in 39 factorial is 47.

## What Is Factorial?

A factorial is showed by an integer and an exclamation mark. In arithmetic, factorial is a multiplication procedure of natural numbers .

It multiplies the number by every natural number that is less than it .

Symbolically, it is showed as "!".

The function is used, among other things, to find the "n" way pieces can be established .

## Factorial Formula

To find the factorial of any given number, change the value for n in the given formulation :

n! = n × (n-1) × (n-2) × (n-3) × ….× 3 × 2 × 1

The expansion of the formula provides numbers to be replicated at the same time to obtain the factorial of the number.

We can also figure out a factorial from the prior one. The factorial of any number is that number replicated the factorial of (that number minus 1).

So the rule is : n! = n × (n−1)!

Example :
39! Factorial = 39 x 38 x 37 x 36 x ... x 3 x 2 x 1 = 39 × 38! = 20397882081197443358640281739902897356800000000

## What are Factorials Used For?

The best use of factorial is in Combinations and Permutations.

Example : Determine how to arrange letters without repeating?

There one way for 1 letter "a":
2 ways for two letters "ab": ab, ba.
There are 6 ways for 3 letters "abc": abc acb cab bac bca.
There are 24 ways for 1234 of the letters "abcd"

## Frequently Asked Questions on Factorial

### Can we have factorials for negative numbers ?

Negative number factorials are undefined

### What Is 0!

Zero factorial or Factorial of 0 is simple, and its value is equal to 1. So, 0! = 1.