391604428 has 6 divisors (see below), whose sum is σ = 685307756. Its totient is φ = 195802212.

The previous prime is 391604419. The next prime is 391604443. The reversal of 391604428 is 824406193.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48950550 + ... + 48950557.

Almost surely, 2^391604428 is an apocalyptic number.

It is an amenable number.

391604428 is a deficient number, since it is larger than the sum of its proper divisors (293703328).

391604428 is a wasteful number, since it uses less digits than its factorization.

391604428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97901111 (or 97901109 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 391604428 is about 19788.9976502096. The cubic root of 391604428 is about 731.6148824715.

The spelling of 391604428 in words is "three hundred ninety-one million, six hundred four thousand, four hundred twenty-eight".