Names of 1999
| Nominal | 1999 |
| Cardinal | one thousand nine hundred ninety-nine |
| Ordinal | 1,999th |
| This number as US currency | one thousand nine hundred ninety-nine dollars |
| Is 1999 an odd number? | 1999 is an odd number |
| Is 1999 an even number? | 1999 is NOT an even number |
| Is 1999 a palindrome? | 1999 is NOT a palindrome number |
| Is 1999 a triangle number? | 1999 is NOT a triangle number |
1999 in other Bases
| Base 2 (Binary) | 111110011112 |
| Base 3 (Ternary) | 22020013 |
| Base 4 (Quaternary) | 1330334 |
| Base 5 (Quinary) | 304445 |
| Base 6 (Senary) | 131316 |
| Base 8 (Octal) | 37178 |
| Base 12 (Duodecimal) | 11A712 |
| Base 16 (Hexadecimal) | 7CF16 |
| Base 20 (Vigesimal) | 4JJ20 |
Primes and Factors tests for 1999
| Is 1999 a Prime Number? | 1999 is a prime |
| Is 1999 a perfect number? | 1999 is NOT a perfect number |
| Is 1999 a Mersenne Prime? | 1999 is NOT a Mersenne prime |
| Is 1999 a Fermat Prime? | 1999 is NOT a Fermat prime |
| Is 1999 a Fibonacci Prime? | 1999 is NOT a Fibonacci prime |
| Is 1999 a Partition Prime? | 1999 is NOT a Partition prime |
| Is 1999 a Pell Prime? | 1999 is NOT a Pell prime |
| Prime Factors | Prime factors of 1999 |
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1999 in other Numerals
| 1999 in Roman Numeral | MCMXCIX |
| 1999 in Chinese Numeral | 壹仟玖佰玖拾玖 |
| 1999 in Egyptian Numeral | 𓆼𓍪𓎎𓐂 |
| 1999 in Babylonian Numeral |   |
Roots and stuff for 1999
| Is 1999 a square number? | 1999 is NOT a square number |
| Is 1999 a cube number? | 1999 is NOT a cube number |
| Square root of the number 1999 | 44.710177812216 |
| Cube root of the number 1999 | 12.597110280457 |
Recreational math for 1999
| Number 1999 reversed | 9991 |
| Sum of the digits | 28 |
| No of digits | 4 |