397504302656 has 28 divisors (see below), whose sum is σ = 789218979852. Its totient is φ = 198645977088.

The previous prime is 397504302581. The next prime is 397504302659. The reversal of 397504302656 is 656203405793.

It can be written as a sum of positive squares in 2 ways, for example, as 3722952256 + 393781350400 = 61016^2 + 627520^2 .

It is not an unprimeable number, because it can be changed into a prime (397504302659) 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, 1538165 + ... + 1777908.

Almost surely, 2^397504302656 is an apocalyptic number.

It is an amenable number.

397504302656 is a deficient number, since it is larger than the sum of its proper divisors (391714677196).

397504302656 is a wasteful number, since it uses less digits than its factorization.

397504302656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317958 (or 3317948 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 50.

The spelling of 397504302656 in words is "three hundred ninety-seven billion, five hundred four million, three hundred two thousand, six hundred fifty-six".