What is the factorial of 398? (398!) 398 Factorial

What is the factorial of 398?

Here we will show you how to calculate the factorial of 398 (aka 398 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 398 can be written as 398 followed by an exclamation mark like this: 398!

Factorial of 398 means that you multiply 398 by every number below it. Therefore, you calculate the factorial of 398 by multiplying 398 by 397, then by 396, and so on all the way down to 1. In other words, we calculate 398 × 397 × 396 × ... × 1 to get 398 factorial.

The answer to 398 factorial (398!) contains 864 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 398 factorial:

4.0121881482 × 10⁸⁶³

The answer above is also sometimes written as 4.0121881482e+863. Regardless, it means that the approximate answer to 398! is 40121881482 followed by 853 more digits.

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Like we promised, below is the exact answer to 398 factorial (398!) with all 864 digits:

401218814828470521693909588468063946432973577857161400117070463300766899556308467645855129370070580678536031171903864729625928338869156862336854565456159134945749712724549889890112420753803547896773277659452825129466001973171161227794463914220236035998060632959413752576508756850130295122464741022879873921616599935863193673723999571014820487897160597364361054973610011195435503207134728184650186840476585106674865860265326831280103748994490975009431718271220616749982801972761117996443851315466305790931076475887284686355745372175638578534234705492092544785884753172432439721002570935818449961209761543261888224934634059123409515758959359788763023681386977554226068002644159309639103060378543804695828793137866907108508914009398880949624972401040897313238835244564480000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

What is the factorial of 399?
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