What is the factorial of 397? (397!) 397 Factorial

What is the factorial of 397?

Here we will show you how to calculate the factorial of 397 (aka 397 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 397 can be written as 397 followed by an exclamation mark like this: 397!

Factorial of 397 means that you multiply 397 by every number below it. Therefore, you calculate the factorial of 397 by multiplying 397 by 396, then by 395, and so on all the way down to 1. In other words, we calculate 397 × 396 × 395 × ... × 1 to get 397 factorial.

The answer to 397 factorial (397!) contains 862 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 397 factorial:

1.0080874744 × 10⁸⁶¹

The answer above is also sometimes written as 1.0080874744e+861. Regardless, it means that the approximate answer to 397! is 10080874744 followed by 851 more digits.

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Like we promised, below is the exact answer to 397 factorial (397!) with all 862 digits:

1008087474443393270587712533839356649329079341349651759088116741961725878282182079512198817512740152458633244150512222938758613916756675533509684837829545565190325911368215803744001057170360673107470546883047299320266336616007942783403175663869939788939850836581441589388212956909875113373026987494673050054313065165485411240512561736218141929389850747146635816516608068330239957806871176343342177991147198760489612714234489525829406404508771293993547030832212604899454276313470145719708169134337451736007729838912775593858656714009142157121192727367066695441921490382996079701011484763362939601029551616235900062649834319405551547133063718062218652465796426015643386941316983190047997639142069861044795962657957053036454557812560002385992392967439440485524711669760000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

What is the factorial of 398?
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