397552689 has 6 divisors (see below), whose sum is σ = 574242786. Its totient is φ = 265035120.

The previous prime is 397552669. The next prime is 397552691. The reversal of 397552689 is 986255793.

397552689 is a `hidden beast` number, since 3 + 9 + 7 + 552 + 6 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 387893025 + 9659664 = 19695^2 + 3108^2 .

It is not a de Polignac number, because 397552689 - 2¹⁷ = 397421617 is a prime.

It is a super-2 number, since 2×397552689² = 316096281062261442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397552669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22086252 + ... + 22086269.

It is an arithmetic number, because the mean of its divisors is an integer number (95707131).

Almost surely, 2^397552689 is an apocalyptic number.

It is an amenable number.

397552689 is a deficient number, since it is larger than the sum of its proper divisors (176690097).

397552689 is a wasteful number, since it uses less digits than its factorization.

397552689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44172527 (or 44172524 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The square root of 397552689 is about 19938.7233543173. The cubic root of 397552689 is about 735.3005628997.

The spelling of 397552689 in words is "three hundred ninety-seven million, five hundred fifty-two thousand, six hundred eighty-nine".