397856166 has 32 divisors (see below), whose sum is σ = 814924800. Its totient is φ = 129455040.

The previous prime is 397856119. The next prime is 397856177. The reversal of 397856166 is 661658793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37471 + ... + 46901.

It is an arithmetic number, because the mean of its divisors is an integer number (25466400).

Almost surely, 2^397856166 is an apocalyptic number.

397856166 is an abundant number, since it is smaller than the sum of its proper divisors (417068634).

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

397856166 is a wasteful number, since it uses less digits than its factorization.

397856166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9604.

The product of its digits is 1632960, while the sum is 51.

The square root of 397856166 is about 19946.3321440309. The cubic root of 397856166 is about 735.4876157177.

The spelling of 397856166 in words is "three hundred ninety-seven million, eight hundred fifty-six thousand, one hundred sixty-six".