396931 has 2 divisors, whose sum is σ = 396932. Its totient is φ = 396930.

The previous prime is 396919. The next prime is 396937. The reversal of 396931 is 139693.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396931 is a prime.

It is a super-2 number, since 2×396931² = 315108437522, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 396893 and 396902.

It is not a weakly prime, because it can be changed into another prime (396937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198465 + 198466.

It is an arithmetic number, because the mean of its divisors is an integer number (198466).

2³⁹⁶⁹³¹ is an apocalyptic number.

396931 is a deficient number, since it is larger than the sum of its proper divisors (1).

396931 is an equidigital number, since it uses as much as digits as its factorization.

396931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 31.

The square root of 396931 is about 630.0246026942. The cubic root of 396931 is about 73.4917077661.

Subtracting from 396931 its sum of digits (31), we obtain a square (396900 = 630²).

The spelling of 396931 in words is "three hundred ninety-six thousand, nine hundred thirty-one".