391684612 has 12 divisors (see below), whose sum is σ = 747761616. Its totient is φ = 178038440.

The previous prime is 391684609. The next prime is 391684619. The reversal of 391684612 is 216486193.

It is not an unprimeable number, because it can be changed into a prime (391684619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4450918 + ... + 4451005.

It is an arithmetic number, because the mean of its divisors is an integer number (62313468).

Almost surely, 2^391684612 is an apocalyptic number.

It is an amenable number.

391684612 is a deficient number, since it is larger than the sum of its proper divisors (356077004).

391684612 is a wasteful number, since it uses less digits than its factorization.

391684612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901938 (or 8901936 counting only the distinct ones).

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

The square root of 391684612 is about 19791.0235207783. The cubic root of 391684612 is about 731.6648136436.

The spelling of 391684612 in words is "three hundred ninety-one million, six hundred eighty-four thousand, six hundred twelve".