7318 has 4 divisors (see below), whose sum is σ = 10980.
Its totient is φ = 3658.
The previous prime is 7309. The next prime is 7321. The reversal of 7318 is 8137.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8137 = 79 ⋅103.
It is a plaindrome in base 15.
It is a nialpdrome in base 11.
It is a junction number, because it is equal to n+sod(n) for n = 7295 and 7304.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828 + ... + 1831.
It is an arithmetic number, because the mean of its divisors is an integer number (2745).
27318 is an apocalyptic number.
7318 is a deficient number, since it is larger than the sum of its proper divisors (3662).
7318 is a wasteful number, since it uses less digits than its factorization.
7318 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3661.
The product of its digits is 168, while the sum is 19.
The square root of 7318 is about 85.5453096318.
The cubic root of 7318 is about 19.4147052568.
Adding to 7318 its sum of digits (19), we get a palindrome (7337).
It can be divided in two parts, 73 and 18, that added together give a triangular number (91 = T13).
The spelling of 7318 in words is "seven thousand, three hundred eighteen".