397111866 has 8 divisors (see below), whose sum is σ = 794223744. Its totient is φ = 132370620.

The previous prime is 397111849. The next prime is 397111873. The reversal of 397111866 is 668111793.

It is a sphenic number, since it is the product of 3 distinct primes.

397111866 is an admirable number.

It is a Curzon number.

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, 33092650 + ... + 33092661.

It is an arithmetic number, because the mean of its divisors is an integer number (99277968).

Almost surely, 2^397111866 is an apocalyptic number.

397111866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

397111866 is a wasteful number, since it uses less digits than its factorization.

397111866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66185316.

The product of its digits is 54432, while the sum is 42.

The square root of 397111866 is about 19927.6658442478. The cubic root of 397111866 is about 735.0286850761.

The spelling of 397111866 in words is "three hundred ninety-seven million, one hundred eleven thousand, eight hundred sixty-six".