397157328 has 30 divisors (see below), whose sum is σ = 1111489314. Its totient is φ = 132385728.

The previous prime is 397157317. The next prime is 397157359. The reversal of 397157328 is 823751793.

It is a happy number.

397157328 is a `hidden beast` number, since 3 + 9 + 71 + 573 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 287913024 + 109244304 = 16968^2 + 10452^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1378875 + ... + 1379162.

Almost surely, 2^397157328 is an apocalyptic number.

It is an amenable number.

397157328 is an abundant number, since it is smaller than the sum of its proper divisors (714331986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397157328 is a wasteful number, since it uses less digits than its factorization.

397157328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758051 (or 2758042 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 397157328 is about 19928.8064870930. The cubic root of 397157328 is about 735.0567330913.

The spelling of 397157328 in words is "three hundred ninety-seven million, one hundred fifty-seven thousand, three hundred twenty-eight".