397237128 has 32 divisors (see below), whose sum is σ = 1027339200. Its totient is φ = 127846208.

The previous prime is 397237111. The next prime is 397237133. The reversal of 397237128 is 821732793.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 397237128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284676 + ... + 286067.

It is an arithmetic number, because the mean of its divisors is an integer number (32104350).

Almost surely, 2^397237128 is an apocalyptic number.

It is an amenable number.

397237128 is an abundant number, since it is smaller than the sum of its proper divisors (630102072).

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

397237128 is a wasteful number, since it uses less digits than its factorization.

397237128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570781 (or 570777 counting only the distinct ones).

The product of its digits is 127008, while the sum is 42.

The square root of 397237128 is about 19930.8085134547. The cubic root of 397237128 is about 735.1059609371.

The spelling of 397237128 in words is "three hundred ninety-seven million, two hundred thirty-seven thousand, one hundred twenty-eight".