397255957 has 4 divisors (see below), whose sum is σ = 454006816. Its totient is φ = 340505100.

The previous prime is 397255897. The next prime is 397255961. The reversal of 397255957 is 759552793.

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, and also an emirpimes, since its reverse is a distinct semiprime: 759552793 = 31 ⋅24501703.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397255957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397255987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28375419 + ... + 28375432.

It is an arithmetic number, because the mean of its divisors is an integer number (113501704).

Almost surely, 2^397255957 is an apocalyptic number.

It is an amenable number.

397255957 is a deficient number, since it is larger than the sum of its proper divisors (56750859).

397255957 is an equidigital number, since it uses as much as digits as its factorization.

397255957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56750858.

The product of its digits is 2976750, while the sum is 52.

The square root of 397255957 is about 19931.2808670191. The cubic root of 397255957 is about 735.1175754032.

The spelling of 397255957 in words is "three hundred ninety-seven million, two hundred fifty-five thousand, nine hundred fifty-seven".