40
Everything about the number 40 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 40
| Nominal | 40 |
| Cardinal | forty |
| Ordinal | 40th |
| This number as US currency | forty dollars |
Properties (and some facts) of 40
| 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 |
| Is 40 a triangle number? | 40 is not a triangle number |
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40 in other bases
| Base 2 (Binary) | 101000 |
| Base 3 (Ternary) | 1111 |
| Base 4 (Quaternary) | 220 |
| Base 5 (Quinary) | 130 |
| Base 6 (Senary) | 104 |
| Base 8 (Octal) | 50 |
| Base 12 (Duodecimal) | 34 |
| Base 16 (Hexadecimal) | 28 |
| Base 20 (Vigesimal) | 20 |
Primes and factors tests for 40
| Is 40 a prime number? | 40 is not a prime number |
| 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 |
40 in other numeral systems
| 40 in Roman numerals | XL |
| 40 in Chinese numerals | 肆拾 |
| 40 in Babylonian numerals |  |
| 40 in Egyptian numerals | 𓎉 |
Roots and squares 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 40 | 6.3245553203368 |
| Cube root of 40 | 3.4199518933534 |
Recreational math for 40
| Number 40 reversed | 04 |
| Sum of the digits | 4 |
| Number of digits | 2 |
Arithmetic tables for 40
Other pages about 40
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