Names of 399
| Nominal | 399 |
| Cardinal | three hundred ninety-nine |
| Ordinal | 399th |
| This number as US currency | three hundred ninety-nine dollars |
| Is 399 an odd number? | 399 is an odd number |
| Is 399 an even number? | 399 is NOT an even number |
| Is 399 a palindrome? | 399 is NOT a palindrome number |
| Is 399 a triangle number? | 399 is NOT a triangle number |
399 in other Bases
| Base 2 (Binary) | 1100011112 |
| Base 3 (Ternary) | 1122103 |
| Base 4 (Quaternary) | 120334 |
| Base 5 (Quinary) | 30445 |
| Base 6 (Senary) | 15036 |
| Base 8 (Octal) | 6178 |
| Base 12 (Duodecimal) | 29312 |
| Base 16 (Hexadecimal) | 18F16 |
| Base 20 (Vigesimal) | JJ20 |
Primes and Factors tests for 399
| Is 399 a Prime Number? | 399 is NOT a prime |
| Is 399 a perfect number? | 399 is NOT a perfect number |
| Is 399 a Mersenne Prime? | 399 is NOT a Mersenne prime |
| Is 399 a Fermat Prime? | 399 is NOT a Fermat prime |
| Is 399 a Fibonacci Prime? | 399 is NOT a Fibonacci prime |
| Is 399 a Partition Prime? | 399 is NOT a Partition prime |
| Is 399 a Pell Prime? | 399 is NOT a Pell prime |
| Prime Factors | Prime factors of 399 |
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399 in other Numerals
| 399 in Roman Numeral | CCCXCIX |
| 399 in Chinese Numeral | 叄佰玖拾玖 |
| 399 in Egyptian Numeral | 𓍤𓎎𓐂 |
| 399 in Babylonian Numeral |   |
Roots and stuff for 399
| Is 399 a square number? | 399 is NOT a square number |
| Is 399 a cube number? | 399 is NOT a cube number |
| Square root of the number 399 | 19.974984355438 |
| Cube root of the number 399 | 7.3619178209542 |
Recreational math for 399
| Number 399 reversed | 993 |
| Sum of the digits | 21 |
| No of digits | 3 |