397988656 has 20 divisors (see below), whose sum is σ = 830419072. Its totient is φ = 183686976.

The previous prime is 397988651. The next prime is 397988677. The reversal of 397988656 is 656889793.

It is a junction number, because it is equal to n+sod(n) for n = 397988594 and 397988603.

It is not an unprimeable number, because it can be changed into a prime (397988651) 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, 956496 + ... + 956911.

Almost surely, 2^397988656 is an apocalyptic number.

It is an amenable number.

397988656 is an abundant number, since it is smaller than the sum of its proper divisors (432430416).

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

397988656 is a wasteful number, since it uses less digits than its factorization.

397988656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913428 (or 1913422 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 61.

The square root of 397988656 is about 19949.6530295642. The cubic root of 397988656 is about 735.5692481834.

The spelling of 397988656 in words is "three hundred ninety-seven million, nine hundred eighty-eight thousand, six hundred fifty-six".