391388352 has 56 divisors (see below), whose sum is σ = 1050170112. Its totient is φ = 128620800.

The previous prime is 391388351. The next prime is 391388377. The reversal of 391388352 is 253883193.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (391388351) 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, 724 + ... + 27987.

Almost surely, 2^391388352 is an apocalyptic number.

391388352 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391388352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (525085056).

391388352 is an abundant number, since it is smaller than the sum of its proper divisors (658781760).

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

391388352 is a wasteful number, since it uses less digits than its factorization.

391388352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28797 (or 28787 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 391388352 is about 19783.5373985544. The cubic root of 391388352 is about 731.4802964025.

The spelling of 391388352 in words is "three hundred ninety-one million, three hundred eighty-eight thousand, three hundred fifty-two".