391025264 has 40 divisors (see below), whose sum is σ = 871194240. Its totient is φ = 166546368.

The previous prime is 391025233. The next prime is 391025267. The reversal of 391025264 is 462520193.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 391025264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391025267) 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, 7547 + ... + 28965.

It is an arithmetic number, because the mean of its divisors is an integer number (21779856).

Almost surely, 2^391025264 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 391025264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435597120).

391025264 is an abundant number, since it is smaller than the sum of its proper divisors (480168976).

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

391025264 is a wasteful number, since it uses less digits than its factorization.

391025264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21597 (or 21591 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 391025264 is about 19774.3587506650. The cubic root of 391025264 is about 731.2540301821.

The spelling of 391025264 in words is "three hundred ninety-one million, twenty-five thousand, two hundred sixty-four".