1999
Everything about the number 1999 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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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 |
Properties (and some facts) of 1999
| 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 |
| Is 1999 a triangle number? | 1999 is not a triangle number |
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1999 in other bases
| Base 2 (Binary) | 11111001111 |
| Base 3 (Ternary) | 2202001 |
| Base 4 (Quaternary) | 133033 |
| Base 5 (Quinary) | 30444 |
| Base 6 (Senary) | 13131 |
| Base 8 (Octal) | 3717 |
| Base 12 (Duodecimal) | 11A7 |
| Base 16 (Hexadecimal) | 7CF |
| Base 20 (Vigesimal) | 4JJ |
Primes and factors tests for 1999
| Is 1999 a prime number? | 1999 is a prime number |
| 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 |
1999 in other numeral systems
| 1999 in Roman numerals | MCMXCIX |
| 1999 in Chinese numerals | 壹仟玖佰玖拾玖 |
| 1999 in Babylonian numerals |   |
| 1999 in Egyptian numerals | 𓆼𓍪𓎎𓐂 |
Roots and squares 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 1999 | 44.710177812216 |
| Cube root of 1999 | 12.597110280457 |
Recreational math for 1999
| Number 1999 reversed | 9991 |
| Sum of the digits | 28 |
| Number of digits | 4 |
Arithmetic tables for 1999
Other pages about 1999
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