391323216 has 80 divisors (see below), whose sum is σ = 1060378560. Its totient is φ = 124185600.

The previous prime is 391323209. The next prime is 391323217. The reversal of 391323216 is 612323193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391323217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99691 + ... + 103541.

It is an arithmetic number, because the mean of its divisors is an integer number (13254732).

Almost surely, 2^391323216 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 391323216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530189280).

391323216 is an abundant number, since it is smaller than the sum of its proper divisors (669055344).

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

391323216 is a wasteful number, since it uses less digits than its factorization.

391323216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964 (or 3958 counting only the distinct ones).

The product of its digits is 5832, while the sum is 30.

The square root of 391323216 is about 19781.8911128335. The cubic root of 391323216 is about 731.4397157842.

The spelling of 391323216 in words is "three hundred ninety-one million, three hundred twenty-three thousand, two hundred sixteen".