391380628 has 12 divisors (see below), whose sum is σ = 685184500. Its totient is φ = 195613632.

The previous prime is 391380589. The next prime is 391380637. The reversal of 391380628 is 826083193.

It can be written as a sum of positive squares in 2 ways, for example, as 32581264 + 358799364 = 5708^2 + 18942^2 .

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, 6801 + ... + 28792.

Almost surely, 2^391380628 is an apocalyptic number.

It is an amenable number.

391380628 is a deficient number, since it is larger than the sum of its proper divisors (293803872).

391380628 is a wasteful number, since it uses less digits than its factorization.

391380628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38346 (or 38344 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 391380628 is about 19783.3421847776. The cubic root of 391380628 is about 731.4754844802.

The spelling of 391380628 in words is "three hundred ninety-one million, three hundred eighty thousand, six hundred twenty-eight".