391189960 has 32 divisors (see below), whose sum is σ = 1005917760. Its totient is φ = 134122176.

The previous prime is 391189951. The next prime is 391190017. The reversal of 391189960 is 69981193.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 391189960.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698274 + ... + 698833.

It is an arithmetic number, because the mean of its divisors is an integer number (31434930).

Almost surely, 2^391189960 is an apocalyptic number.

It is an amenable number.

391189960 is an abundant number, since it is smaller than the sum of its proper divisors (614727800).

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

391189960 is a wasteful number, since it uses less digits than its factorization.

391189960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397125 (or 1397121 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 391189960 is about 19778.5226950852. The cubic root of 391189960 is about 731.3566814429.

The spelling of 391189960 in words is "three hundred ninety-one million, one hundred eighty-nine thousand, nine hundred sixty".