391940416 has 42 divisors (see below), whose sum is σ = 904744698. Its totient is φ = 167973120.

The previous prime is 391940411. The next prime is 391940429. The reversal of 391940416 is 614049193.

It can be written as a sum of positive squares in only one way, i.e., 220225600 + 171714816 = 14840^2 + 13104^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391940411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59355 + ... + 65626.

Almost surely, 2^391940416 is an apocalyptic number.

It is an amenable number.

391940416 is an abundant number, since it is smaller than the sum of its proper divisors (512804282).

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

391940416 is a wasteful number, since it uses less digits than its factorization.

391940416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125007 (or 124990 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 391940416 is about 19797.4850928091. The cubic root of 391940416 is about 731.8240591611.

The spelling of 391940416 in words is "three hundred ninety-one million, nine hundred forty thousand, four hundred sixteen".