391317912 has 32 divisors (see below), whose sum is σ = 1086994800. Its totient is φ = 130439232.

The previous prime is 391317853. The next prime is 391317919. The reversal of 391317912 is 219713193.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391317919) by changing a digit.

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, 905613 + ... + 906044.

Almost surely, 2^391317912 is an apocalyptic number.

It is an amenable number.

391317912 is an abundant number, since it is smaller than the sum of its proper divisors (695676888).

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

391317912 is a wasteful number, since it uses less digits than its factorization.

391317912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811672 (or 1811662 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 391317912 is about 19781.7570503735. The cubic root of 391317912 is about 731.4364111214.

The spelling of 391317912 in words is "three hundred ninety-one million, three hundred seventeen thousand, nine hundred twelve".