Names of 40
| Nominal | 40 |
| Cardinal | forty |
| Ordinal | 40th |
| This number as US currency | forty dollars |
| Is 40 an odd number? | 40 is NOT an odd number |
| Is 40 an even number? | 40 is an even number |
| Is 40 a palindrome? | 40 is NOT a palindrome number |
| Is 40 a triangle number? | 40 is NOT a triangle number |
40 in other Bases
| Base 2 (Binary) | 1010002 |
| Base 3 (Ternary) | 11113 |
| Base 4 (Quaternary) | 2204 |
| Base 5 (Quinary) | 1305 |
| Base 6 (Senary) | 1046 |
| Base 8 (Octal) | 508 |
| Base 12 (Duodecimal) | 3412 |
| Base 16 (Hexadecimal) | 2816 |
| Base 20 (Vigesimal) | 2020 |
Primes and Factors tests for 40
| Is 40 a Prime Number? | 40 is NOT a prime |
| Is 40 a perfect number? | 40 is NOT a perfect number |
| Is 40 a Mersenne Prime? | 40 is NOT a Mersenne prime |
| Is 40 a Fermat Prime? | 40 is NOT a Fermat prime |
| Is 40 a Fibonacci Prime? | 40 is NOT a Fibonacci prime |
| Is 40 a Partition Prime? | 40 is NOT a Partition prime |
| Is 40 a Pell Prime? | 40 is NOT a Pell prime |
| Prime Factors | Prime factors of 40 |
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40 in other Numerals
| 40 in Roman Numeral | XL |
| 40 in Chinese Numeral | 肆拾 |
| 40 in Egyptian Numeral | 𓎉 |
| 40 in Babylonian Numeral |  |
Roots and stuff for 40
| Is 40 a square number? | 40 is NOT a square number |
| Is 40 a cube number? | 40 is NOT a cube number |
| Square root of the number 40 | 6.3245553203368 |
| Cube root of the number 40 | 3.4199518933534 |
Recreational math for 40
| Number 40 reversed | 04 |
| Sum of the digits | 4 |
| No of digits | 2 |