397215865 has 32 divisors (see below), whose sum is σ = 521404416. Its totient is φ = 289586880.

The previous prime is 397215853. The next prime is 397215887. The reversal of 397215865 is 568512793.

It is not a de Polignac number, because 397215865 - 2¹⁵ = 397183097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238024 + ... + 239686.

It is an arithmetic number, because the mean of its divisors is an integer number (16293888).

Almost surely, 2^397215865 is an apocalyptic number.

It is an amenable number.

397215865 is a deficient number, since it is larger than the sum of its proper divisors (124188551).

397215865 is a wasteful number, since it uses less digits than its factorization.

397215865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its digits is 453600, while the sum is 46.

The square root of 397215865 is about 19930.2750859089. The cubic root of 397215865 is about 735.0928446430.

The spelling of 397215865 in words is "three hundred ninety-seven million, two hundred fifteen thousand, eight hundred sixty-five".