397656959 has 8 divisors (see below), whose sum is σ = 474224640. Its totient is φ = 326029176.

The previous prime is 397656953. The next prime is 397656977. The reversal of 397656959 is 959656793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397656959 - 2⁸ = 397656703 is a prime.

It is a super-2 number, since 2×397656959² = 316262114082255362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397656898 and 397656907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397656953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1234799 + ... + 1235120.

It is an arithmetic number, because the mean of its divisors is an integer number (59278080).

Almost surely, 2^397656959 is an apocalyptic number.

397656959 is a deficient number, since it is larger than the sum of its proper divisors (76567681).

397656959 is a wasteful number, since it uses less digits than its factorization.

397656959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469949.

The product of its digits is 13778100, while the sum is 59.

The square root of 397656959 is about 19941.3379440799. The cubic root of 397656959 is about 735.3648420840.

The spelling of 397656959 in words is "three hundred ninety-seven million, six hundred fifty-six thousand, nine hundred fifty-nine".