Names of 138
| Nominal | 138 |
| Cardinal | one hundred thirty-eight |
| Ordinal | 138th |
| This number as US currency | one hundred thirty-eight dollars |
| Is 138 an odd number? | 138 is NOT an odd number |
| Is 138 an even number? | 138 is an even number |
| Is 138 a palindrome? | 138 is NOT a palindrome number |
| Is 138 a triangle number? | 138 is NOT a triangle number |
138 in other Bases
| Base 2 (Binary) | 100010102 |
| Base 3 (Ternary) | 120103 |
| Base 4 (Quaternary) | 20224 |
| Base 5 (Quinary) | 10235 |
| Base 6 (Senary) | 3506 |
| Base 8 (Octal) | 2128 |
| Base 12 (Duodecimal) | B612 |
| Base 16 (Hexadecimal) | 8A16 |
| Base 20 (Vigesimal) | 6I20 |
Primes and Factors tests for 138
| Is 138 a Prime Number? | 138 is NOT a prime |
| Is 138 a perfect number? | 138 is NOT a perfect number |
| Is 138 a Mersenne Prime? | 138 is NOT a Mersenne prime |
| Is 138 a Fermat Prime? | 138 is NOT a Fermat prime |
| Is 138 a Fibonacci Prime? | 138 is NOT a Fibonacci prime |
| Is 138 a Partition Prime? | 138 is NOT a Partition prime |
| Is 138 a Pell Prime? | 138 is NOT a Pell prime |
| Prime Factors | Prime factors of 138 |
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138 in other Numerals
| 138 in Roman Numeral | CXXXVIII |
| 138 in Chinese Numeral | 壹佰叄拾捌 |
| 138 in Egyptian Numeral | 𓍢𓎈𓐁 |
| 138 in Babylonian Numeral |   |
Roots and stuff for 138
| Is 138 a square number? | 138 is NOT a square number |
| Is 138 a cube number? | 138 is NOT a cube number |
| Square root of the number 138 | 11.747340124471 |
| Cube root of the number 138 | 5.1676492523636 |
Recreational math for 138
| Number 138 reversed | 831 |
| Sum of the digits | 12 |
| No of digits | 3 |