397313688 has 32 divisors (see below), whose sum is σ = 1027537200. Its totient is φ = 127870848.

The previous prime is 397313663. The next prime is 397313723. The reversal of 397313688 is 886313793.

It is a super-2 number, since 2×397313688² = 315716333344322688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 284731 + ... + 286122.

Almost surely, 2^397313688 is an apocalyptic number.

It is an amenable number.

397313688 is an abundant number, since it is smaller than the sum of its proper divisors (630223512).

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

397313688 is a wasteful number, since it uses less digits than its factorization.

397313688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570891 (or 570887 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 397313688 is about 19932.7290655344. The cubic root of 397313688 is about 735.1531838619.

The spelling of 397313688 in words is "three hundred ninety-seven million, three hundred thirteen thousand, six hundred eighty-eight".