391328896 has 96 divisors (see below), whose sum is σ = 928612080. Its totient is φ = 163699200.

The previous prime is 391328893. The next prime is 391328911. The reversal of 391328896 is 698823193.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (391328891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268971 + ... + 270421.

Almost surely, 2^391328896 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 391328896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464306040).

391328896 is an abundant number, since it is smaller than the sum of its proper divisors (537283184).

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

391328896 is a wasteful number, since it uses less digits than its factorization.

391328896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 1503 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 391328896 is about 19782.0346779597. The cubic root of 391328896 is about 731.4432546811.

The spelling of 391328896 in words is "three hundred ninety-one million, three hundred twenty-eight thousand, eight hundred ninety-six".