397308872 has 16 divisors (see below), whose sum is σ = 745194060. Its totient is φ = 198590464.

The previous prime is 397308839. The next prime is 397308883. The reversal of 397308872 is 278803793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 356680996 + 40627876 = 18886^2 + 6374^2 .

It is an unprimeable number.

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, 27848 + ... + 39624.

Almost surely, 2^397308872 is an apocalyptic number.

It is an amenable number.

397308872 is a deficient number, since it is larger than the sum of its proper divisors (347885188).

397308872 is a wasteful number, since it uses less digits than its factorization.

397308872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000 (or 15996 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 397308872 is about 19932.6082588306. The cubic root of 397308872 is about 735.1502134868.

The spelling of 397308872 in words is "three hundred ninety-seven million, three hundred eight thousand, eight hundred seventy-two".