391941328 has 20 divisors (see below), whose sum is σ = 766356580. Its totient is φ = 194171904.

The previous prime is 391941301. The next prime is 391941331. The reversal of 391941328 is 823149193.

It can be written as a sum of positive squares in 2 ways, for example, as 166100544 + 225840784 = 12888^2 + 15028^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110625 + ... + 114112.

It is an arithmetic number, because the mean of its divisors is an integer number (38317829).

Almost surely, 2^391941328 is an apocalyptic number.

It is an amenable number.

391941328 is a deficient number, since it is larger than the sum of its proper divisors (374415252).

391941328 is a wasteful number, since it uses less digits than its factorization.

391941328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224854 (or 224848 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 391941328 is about 19797.5081260243. The cubic root of 391941328 is about 731.8246267840.

The spelling of 391941328 in words is "three hundred ninety-one million, nine hundred forty-one thousand, three hundred twenty-eight".