Names of 400
| Nominal | 400 |
| Cardinal | four hundred |
| Ordinal | 400th |
| This number as US currency | four hundred dollars |
| Is 400 an odd number? | 400 is NOT an odd number |
| Is 400 an even number? | 400 is an even number |
| Is 400 a palindrome? | 400 is NOT a palindrome number |
| Is 400 a triangle number? | 400 is NOT a triangle number |
400 in other Bases
| Base 2 (Binary) | 1100100002 |
| Base 3 (Ternary) | 1122113 |
| Base 4 (Quaternary) | 121004 |
| Base 5 (Quinary) | 31005 |
| Base 6 (Senary) | 15046 |
| Base 8 (Octal) | 6208 |
| Base 12 (Duodecimal) | 29412 |
| Base 16 (Hexadecimal) | 19016 |
| Base 20 (Vigesimal) | 10020 |
Primes and Factors tests for 400
| Is 400 a Prime Number? | 400 is NOT a prime |
| Is 400 a perfect number? | 400 is NOT a perfect number |
| Is 400 a Mersenne Prime? | 400 is NOT a Mersenne prime |
| Is 400 a Fermat Prime? | 400 is NOT a Fermat prime |
| Is 400 a Fibonacci Prime? | 400 is NOT a Fibonacci prime |
| Is 400 a Partition Prime? | 400 is NOT a Partition prime |
| Is 400 a Pell Prime? | 400 is NOT a Pell prime |
| Prime Factors | Prime factors of 400 |
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400 in other Numerals
| 400 in Roman Numeral | CD |
| 400 in Chinese Numeral | 肆佰 |
| 400 in Egyptian Numeral | 𓍥 |
| 400 in Babylonian Numeral |   |
Roots and stuff for 400
| Is 400 a square number? | 400 is a square number |
| Is 400 a cube number? | 400 is NOT a cube number |
| Square root of the number 400 | 20 |
| Cube root of the number 400 | 7.3680629972808 |
Recreational math for 400
| Number 400 reversed | 004 |
| Sum of the digits | 4 |
| No of digits | 3 |