397156937856 has 128 divisors (see below), whose sum is σ = 1219202409600. Its totient is φ = 112198361088.

The previous prime is 397156937819. The next prime is 397156937861. The reversal of 397156937856 is 658739651793.

It is a tau number, because it is divible by the number of its divisors (128).

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 15 ways as a sum of consecutive naturals, for example, 590835 + ... + 1069298.

It is an arithmetic number, because the mean of its divisors is an integer number (9525018825).

Almost surely, 2^397156937856 is an apocalyptic number.

It is an amenable number.

397156937856 is an abundant number, since it is smaller than the sum of its proper divisors (822045471744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397156937856 is a wasteful number, since it uses less digits than its factorization.

397156937856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660246 (or 1660234 counting only the distinct ones).

The product of its digits is 257191200, while the sum is 69.

The spelling of 397156937856 in words is "three hundred ninety-seven billion, one hundred fifty-six million, nine hundred thirty-seven thousand, eight hundred fifty-six".