397317318 has 16 divisors (see below), whose sum is σ = 829184256. Its totient is φ = 126680840.

The previous prime is 397317311. The next prime is 397317331. The reversal of 397317318 is 813713793.

It is a super-2 number, since 2×397317318² = 315722102365426248, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 397317318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397317311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1439418 + ... + 1439693.

It is an arithmetic number, because the mean of its divisors is an integer number (51824016).

Almost surely, 2^397317318 is an apocalyptic number.

397317318 is an abundant number, since it is smaller than the sum of its proper divisors (431866938).

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

397317318 is a wasteful number, since it uses less digits than its factorization.

397317318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879139.

The product of its digits is 95256, while the sum is 42.

The square root of 397317318 is about 19932.8201215984. The cubic root of 397317318 is about 735.1554227293.

The spelling of 397317318 in words is "three hundred ninety-seven million, three hundred seventeen thousand, three hundred eighteen".