391344688 has 20 divisors (see below), whose sum is σ = 866549200. Its totient is φ = 167719104.

The previous prime is 391344661. The next prime is 391344719. The reversal of 391344688 is 886443193.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746963 + ... + 1747186.

It is an arithmetic number, because the mean of its divisors is an integer number (43327460).

Almost surely, 2^391344688 is an apocalyptic number.

It is an amenable number.

391344688 is an abundant number, since it is smaller than the sum of its proper divisors (475204512).

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

391344688 is a wasteful number, since it uses less digits than its factorization.

391344688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494164 (or 3494158 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 391344688 is about 19782.4338239763. The cubic root of 391344688 is about 731.4530936312.

The spelling of 391344688 in words is "three hundred ninety-one million, three hundred forty-four thousand, six hundred eighty-eight".