397556388 has 36 divisors (see below), whose sum is σ = 1017049488. Its totient is φ = 130921200.

The previous prime is 397556363. The next prime is 397556417. The reversal of 397556388 is 883655793.

It is a happy number.

397556388 is a `hidden beast` number, since 3 + 9 + 7 + 556 + 3 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63538 + ... + 69513.

Almost surely, 2^397556388 is an apocalyptic number.

It is an amenable number.

397556388 is an abundant number, since it is smaller than the sum of its proper divisors (619493100).

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

397556388 is a wasteful number, since it uses less digits than its factorization.

397556388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133144 (or 133139 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 397556388 is about 19938.8161133002. The cubic root of 397556388 is about 735.3028434094.

The spelling of 397556388 in words is "three hundred ninety-seven million, five hundred fifty-six thousand, three hundred eighty-eight".