400
400 is an even composite number composed of two prime numbers multiplied together.
400 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of fifteen divisors.
Prime factorization of 400:
2^{4} × 5^{2}
(2 × 2 × 2 × 2 × 5 × 5)See below for interesting mathematical facts about the number 400 from the Numbermatics database.
Names of 400
 Cardinal: 400 can be written as Four hundred.
Scientific notation
 Scientific notation: 4 × 10^{2}
Factors of 400
Divisors of 400
Bases of 400
 Binary: 110010000_{2}
 Hexadecimal: 0x190
 Base36: B4
Squares and roots of 400
Scales and comparisons
How big is 400? 400 seconds is equal to 6 minutes, 40 seconds.

To count from 1 to 400 would take you about three minutes.
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomlychosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
 A cube with a volume of 400 cubic inches would be around 0.6 feet tall.
Recreational maths with 400
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The information we have on file for 400 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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