397687912 has 16 divisors (see below), whose sum is σ = 748021860. Its totient is φ = 198215424.

The previous prime is 397687909. The next prime is 397687921. The reversal of 397687912 is 219786793.

It can be written as a sum of positive squares in 2 ways, for example, as 392277636 + 5410276 = 19806^2 + 2326^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 397687912.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75873 + ... + 80944.

Almost surely, 2^397687912 is an apocalyptic number.

It is an amenable number.

397687912 is a deficient number, since it is larger than the sum of its proper divisors (350333948).

397687912 is a wasteful number, since it uses less digits than its factorization.

397687912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157140 (or 157136 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 52.

The square root of 397687912 is about 19942.1140303630. The cubic root of 397687912 is about 735.3839214746.

The spelling of 397687912 in words is "three hundred ninety-seven million, six hundred eighty-seven thousand, nine hundred twelve".