7
Everything about the number 7 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
Advertisement
Names of 7
| Nominal | 7 |
| Cardinal | seven |
| Ordinal | 7th |
| This number as US currency | seven dollars |
Properties (and some facts) of 7
| Is 7 an odd number? | 7 is an odd number |
| Is 7 an even number? | 7 is not an even number |
| Is 7 a palindrome? | 7 is a palindrome |
| Is 7 a triangle number? | 7 is not a triangle number |
| Factorial (7!) of the number 7 | 5040 |
Advertisement
7 in other bases
| Base 2 (Binary) | 111 |
| Base 3 (Ternary) | 21 |
| Base 4 (Quaternary) | 13 |
| Base 5 (Quinary) | 12 |
| Base 6 (Senary) | 11 |
| Base 8 (Octal) | 7 |
| Base 12 (Duodecimal) | 7 |
| Base 16 (Hexadecimal) | 7 |
| Base 20 (Vigesimal) | 7 |
Primes and factors tests for 7
| Is 7 a prime number? | 7 is a prime number |
| Is 7 a perfect number? | 7 is not a perfect number |
| Is 7 a Mersenne prime? | 7 is a Mersenne prime |
| Is 7 a Fermat prime? | 7 is not a Fermat prime |
| Is 7 a Fibonacci prime? | 7 is not a Fibonacci prime |
| Is 7 a partition prime? | 7 is a partition prime |
| Is 7 a Pell prime? | 7 is not a Pell prime |
| Prime Factors | Prime factors of 7 |
7 in other numeral systems
| 7 in Roman numerals | VII |
| 7 in Chinese numerals | 柒 |
| 7 in Babylonian numerals |  |
| 7 in Egyptian numerals | 𓐀 |
Roots and squares for 7
| Is 7 a square number? | 7 is not a square number |
| Is 7 a cube number? | 7 is not a cube number |
| Square root of 7 | 2.6457513110646 |
| Cube root of 7 | 1.9129311827724 |
Recreational math for 7
| Number 7 reversed | 7 |
| Sum of the digits | 7 |
| Number of digits | 1 |
Arithmetic tables for 7
Other pages about 7
Advertisement