391228108 has 12 divisors (see below), whose sum is σ = 689245200. Its totient is φ = 194300912.

The previous prime is 391228087. The next prime is 391228127. The reversal of 391228108 is 801822193.

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, 327616 + ... + 328807.

It is an arithmetic number, because the mean of its divisors is an integer number (57437100).

Almost surely, 2^391228108 is an apocalyptic number.

It is an amenable number.

391228108 is a deficient number, since it is larger than the sum of its proper divisors (298017092).

391228108 is a wasteful number, since it uses less digits than its factorization.

391228108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656576 (or 656574 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 391228108 is about 19779.4870509829. The cubic root of 391228108 is about 731.3804541115.

The spelling of 391228108 in words is "three hundred ninety-one million, two hundred twenty-eight thousand, one hundred eight".