397157 has 4 divisors (see below), whose sum is σ = 418080. Its totient is φ = 376236.

The previous prime is 397153. The next prime is 397181. The reversal of 397157 is 751793.

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 397157 - 2² = 397153 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 (397151) 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, 10433 + ... + 10470.

It is an arithmetic number, because the mean of its divisors is an integer number (104520).

2³⁹⁷¹⁵⁷ is an apocalyptic number.

It is an amenable number.

397157 is a deficient number, since it is larger than the sum of its proper divisors (20923).

397157 is a wasteful number, since it uses less digits than its factorization.

397157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20922.

The product of its digits is 6615, while the sum is 32.

The square root of 397157 is about 630.2039352464. The cubic root of 397157 is about 73.5056530738.

The spelling of 397157 in words is "three hundred ninety-seven thousand, one hundred fifty-seven".