400
Everything about the number 400 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 400
| Nominal | 400 |
| Cardinal | four hundred |
| Ordinal | 400th |
| This number as US currency | four hundred dollars |
Properties (and some facts) of 400
| 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 |
| Is 400 a triangle number? | 400 is not a triangle number |
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400 in other bases
| Base 2 (Binary) | 110010000 |
| Base 3 (Ternary) | 112211 |
| Base 4 (Quaternary) | 12100 |
| Base 5 (Quinary) | 3100 |
| Base 6 (Senary) | 1504 |
| Base 8 (Octal) | 620 |
| Base 12 (Duodecimal) | 294 |
| Base 16 (Hexadecimal) | 190 |
| Base 20 (Vigesimal) | 100 |
Primes and factors tests for 400
| Is 400 a prime number? | 400 is not a prime number |
| 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 |
400 in other numeral systems
| 400 in Roman numerals | CD |
| 400 in Chinese numerals | 肆佰 |
| 400 in Babylonian numerals |   |
| 400 in Egyptian numerals | 𓍥 |
Roots and squares 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 400 | 20 |
| Cube root of 400 | 7.3680629972808 |
Recreational math for 400
| Number 400 reversed | 004 |
| Sum of the digits | 4 |
| Number of digits | 3 |
Arithmetic tables for 400
Other pages about 400
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