6391864 has 32 divisors (see below), whose sum is σ = 12996720. Its totient is φ = 2935296.

The previous prime is 6391841. The next prime is 6391877. The reversal of 6391864 is 4681936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5302 + ... + 6394.

Almost surely, 2^6391864 is an apocalyptic number.

It is an amenable number.

6391864 is an abundant number, since it is smaller than the sum of its proper divisors (6604856).

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

6391864 is a wasteful number, since it uses less digits than its factorization.

6391864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1155 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 6391864 is about 2528.2135985711. The cubic root of 6391864 is about 185.5848450517.

The spelling of 6391864 in words is "six million, three hundred ninety-one thousand, eight hundred sixty-four".