318397 has 4 divisors (see below), whose sum is σ = 320256. Its totient is φ = 316540.

The previous prime is 318377. The next prime is 318403. The reversal of 318397 is 793813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 318397 - 2¹⁵ = 285629 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643 + ... + 1024.

It is an arithmetic number, because the mean of its divisors is an integer number (80064).

2³¹⁸³⁹⁷ is an apocalyptic number.

It is an amenable number.

318397 is a deficient number, since it is larger than the sum of its proper divisors (1859).

318397 is a wasteful number, since it uses less digits than its factorization.

318397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858.

The product of its digits is 4536, while the sum is 31.

The square root of 318397 is about 564.2667808759. The cubic root of 318397 is about 68.2846344806.

The spelling of 318397 in words is "three hundred eighteen thousand, three hundred ninety-seven".