391523328 has 396 divisors, whose sum is σ = 1432818120. Its totient is φ = 105283584.

The previous prime is 391523263. The next prime is 391523333. The reversal of 391523328 is 823325193.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 391523292 and 391523301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23030776 + ... + 23030792.

Almost surely, 2^391523328 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 391523328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (716409060).

391523328 is an abundant number, since it is smaller than the sum of its proper divisors (1041294792).

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

391523328 is a wasteful number, since it uses less digits than its factorization.

391523328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 29 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 391523328 is about 19786.9484256669. The cubic root of 391523328 is about 731.5643739659.

The spelling of 391523328 in words is "three hundred ninety-one million, five hundred twenty-three thousand, three hundred twenty-eight".