397662957 has 12 divisors (see below), whose sum is σ = 580090524. Its totient is φ = 262483200.

The previous prime is 397662943. The next prime is 397662959. The reversal of 397662957 is 759266793.

397662957 is a `hidden beast` number, since 3 + 9 + 7 + 6 + 629 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 218477961 + 179184996 = 14781^2 + 13386^2 .

It is not a de Polignac number, because 397662957 - 2⁸ = 397662701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397662959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217828 + ... + 219645.

It is an arithmetic number, because the mean of its divisors is an integer number (48340877).

Almost surely, 2^397662957 is an apocalyptic number.

It is an amenable number.

397662957 is a deficient number, since it is larger than the sum of its proper divisors (182427567).

397662957 is a wasteful number, since it uses less digits than its factorization.

397662957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437580 (or 437577 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 54.

The square root of 397662957 is about 19941.4883346254. The cubic root of 397662957 is about 735.3685393210.

The spelling of 397662957 in words is "three hundred ninety-seven million, six hundred sixty-two thousand, nine hundred fifty-seven".