7
Number 7 properties
- Prime
- Happy
- Palindrome
- Harshad
- Armstrong
- Mersenne
- 7 is an odd number.
- 7 is a palindrome.
- 7 is a prime number, which means it is only divisible by 1 and itself.
- 7 is an Armstrong (or Narcissistic) number, which means it is the sum of its own digits each raised to the power of the number of digits.
- 7 is a Harshad number, which means it is divisible by the sum of its digits (7 = 7, and 7 is divisible by 7).
Prime factorization
Prime factorization of 7: 7.
Divisors
Divisor count: 2
1, 7
Factors of 7 are: 1, 7.
Representations
In octal, 7 is represented as 7.
In binary, 7 is represented as 111.
In hex, 7 is represented as 7.
Roman numeral: VII
Curiosities
- 7 is part of the infinite sequence of prime numbers.
- 7 reads the same from left to right and right to left.
- 7 is divisible by the sum of its digits.
Related numbers
Nearby primes: 2, 3, 5, 11, 13, 17
Quick answers
Is 7 prime?
Yes, 7 is prime.
What are the factors of 7?
1, 7
What is 7 in binary?
111