391990472 has 16 divisors (see below), whose sum is σ = 766938240. Its totient is φ = 187473616.

The previous prime is 391990457. The next prime is 391990507. The reversal of 391990472 is 274099193.

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, 1065008 + ... + 1065375.

It is an arithmetic number, because the mean of its divisors is an integer number (47933640).

Almost surely, 2^391990472 is an apocalyptic number.

It is an amenable number.

391990472 is a deficient number, since it is larger than the sum of its proper divisors (374947768).

391990472 is a wasteful number, since it uses less digits than its factorization.

391990472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130412 (or 2130408 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 391990472 is about 19798.7492534251. The cubic root of 391990472 is about 731.8552123877.

The spelling of 391990472 in words is "three hundred ninety-one million, nine hundred ninety thousand, four hundred seventy-two".