397130931 has 20 divisors (see below), whose sum is σ = 628143912. Its totient is φ = 249179328.

The previous prime is 397130917. The next prime is 397130933. The reversal of 397130931 is 139031793.

It is not a de Polignac number, because 397130931 - 2⁷ = 397130803 is a prime.

It is a super-2 number, since 2×397130931² = 315425952713853522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (397130933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 142825 + ... + 145578.

Almost surely, 2^397130931 is an apocalyptic number.

397130931 is a deficient number, since it is larger than the sum of its proper divisors (231012981).

397130931 is a wasteful number, since it uses less digits than its factorization.

397130931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288432 (or 288423 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 36.

The square root of 397130931 is about 19928.1441935771. The cubic root of 397130931 is about 735.0404475867.

It can be divided in two parts, 397 and 130931, that added together give a triangular number (131328 = T₅₁₂).

The spelling of 397130931 in words is "three hundred ninety-seven million, one hundred thirty thousand, nine hundred thirty-one".