391938652 has 36 divisors (see below), whose sum is σ = 811422360. Its totient is φ = 165121824.

The previous prime is 391938601. The next prime is 391938661. The reversal of 391938652 is 256839193.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5383 + ... + 28510.

It is an arithmetic number, because the mean of its divisors is an integer number (22539510).

Almost surely, 2^391938652 is an apocalyptic number.

It is an amenable number.

391938652 is an abundant number, since it is smaller than the sum of its proper divisors (419483708).

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

391938652 is a wasteful number, since it uses less digits than its factorization.

391938652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33970 (or 33961 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The square root of 391938652 is about 19797.4405416458. The cubic root of 391938652 is about 731.8229612565.

The spelling of 391938652 in words is "three hundred ninety-one million, nine hundred thirty-eight thousand, six hundred fifty-two".