391877864 has 32 divisors (see below), whose sum is σ = 876251520. Its totient is φ = 160645056.

The previous prime is 391877861. The next prime is 391877873. The reversal of 391877864 is 468778193.

It is not an unprimeable number, because it can be changed into a prime (391877861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150839 + ... + 153414.

It is an arithmetic number, because the mean of its divisors is an integer number (27382860).

Almost surely, 2^391877864 is an apocalyptic number.

It is an amenable number.

391877864 is an abundant number, since it is smaller than the sum of its proper divisors (484373656).

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

391877864 is a wasteful number, since it uses less digits than its factorization.

391877864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304289 (or 304285 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 53.

The square root of 391877864 is about 19795.9052331536. The cubic root of 391877864 is about 731.7851251020.

The spelling of 391877864 in words is "three hundred ninety-one million, eight hundred seventy-seven thousand, eight hundred sixty-four".