397656568 has 16 divisors (see below), whose sum is σ = 778024080. Its totient is φ = 190183488.

The previous prime is 397656563. The next prime is 397656583. The reversal of 397656568 is 865656793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397656563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080405 + ... + 1080772.

It is an arithmetic number, because the mean of its divisors is an integer number (48626505).

Almost surely, 2^397656568 is an apocalyptic number.

It is an amenable number.

397656568 is a deficient number, since it is larger than the sum of its proper divisors (380367512).

397656568 is a wasteful number, since it uses less digits than its factorization.

397656568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161206 (or 2161202 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 55.

The square root of 397656568 is about 19941.3281403220. The cubic root of 397656568 is about 735.3646010657.

The spelling of 397656568 in words is "three hundred ninety-seven million, six hundred fifty-six thousand, five hundred sixty-eight".