Names of 4
| Nominal | 4 |
| Cardinal | four |
| Ordinal | 4th |
| This number as US currency | four dollars |
| Is 4 an odd number? | 4 is NOT an odd number |
| Is 4 an even number? | 4 is an even number |
| Is 4 a palindrome? | 4 is a palindrome number |
| Is 4 a triangle number? | 4 is NOT a triangle number |
| Factorial (n!) of number 4! | 24 |
4 in other Bases
| Base 2 (Binary) | 1002 |
| Base 3 (Ternary) | 113 |
| Base 4 (Quaternary) | 104 |
| Base 5 (Quinary) | 45 |
| Base 6 (Senary) | 46 |
| Base 8 (Octal) | 48 |
| Base 12 (Duodecimal) | 412 |
| Base 16 (Hexadecimal) | 416 |
| Base 20 (Vigesimal) | 420 |
Primes and Factors tests for 4
| Is 4 a Prime Number? | 4 is NOT a prime |
| Is 4 a perfect number? | 4 is NOT a perfect number |
| Is 4 a Mersenne Prime? | 4 is NOT a Mersenne prime |
| Is 4 a Fermat Prime? | 4 is NOT a Fermat prime |
| Is 4 a Fibonacci Prime? | 4 is NOT a Fibonacci prime |
| Is 4 a Partition Prime? | 4 is NOT a Partition prime |
| Is 4 a Pell Prime? | 4 is NOT a Pell prime |
| Prime Factors | Prime factors of 4 |
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4 in other Numerals
| 4 in Roman Numeral | IV |
| 4 in Chinese Numeral | 肆 |
| 4 in Egyptian Numeral | 𓏽 |
| 4 in Babylonian Numeral |  |
Roots and stuff for 4
| Is 4 a square number? | 4 is a square number |
| Is 4 a cube number? | 4 is NOT a cube number |
| Square root of the number 4 | 2 |
| Cube root of the number 4 | 1.5874010519682 |
Recreational math for 4
| Number 4 reversed | 4 |
| Sum of the digits | 4 |
| No of digits | 1 |