315918 has 12 divisors (see below), whose sum is σ = 684528. Its totient is φ = 105300.

The previous prime is 315907. The next prime is 315937. The reversal of 315918 is 819513.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 315891 and 315900.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 315918.

It is an unprimeable number.

315918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8758 + ... + 8793.

It is an arithmetic number, because the mean of its divisors is an integer number (57044).

2³¹⁵⁹¹⁸ is an apocalyptic number.

315918 is an abundant number, since it is smaller than the sum of its proper divisors (368610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

315918 is a wasteful number, since it uses less digits than its factorization.

315918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17559 (or 17556 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 315918 is about 562.0658324431. The cubic root of 315918 is about 68.1069539497.

The spelling of 315918 in words is "three hundred fifteen thousand, nine hundred eighteen".