391883230864 has 80 divisors (see below), whose sum is σ = 806581312000. Its totient is φ = 184121994240.

The previous prime is 391883230859. The next prime is 391883230883. The reversal of 391883230864 is 468032388193.

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, 9136252 + ... + 9179044.

It is an arithmetic number, because the mean of its divisors is an integer number (10082266400).

Almost surely, 2^391883230864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391883230864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403290656000).

391883230864 is an abundant number, since it is smaller than the sum of its proper divisors (414698081136).

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

391883230864 is a wasteful number, since it uses less digits than its factorization.

391883230864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43368 (or 43362 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 391883230864 in words is "three hundred ninety-one billion, eight hundred eighty-three million, two hundred thirty thousand, eight hundred sixty-four".