921686316 has 24 divisors (see below), whose sum is σ = 2156029680. Its totient is φ = 306453312.

The previous prime is 921686251. The next prime is 921686321. The reversal of 921686316 is 613686129.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91971 + ... + 101498.

It is an arithmetic number, because the mean of its divisors is an integer number (89834570).

Almost surely, 2^921686316 is an apocalyptic number.

It is an amenable number.

921686316 is an abundant number, since it is smaller than the sum of its proper divisors (1234343364).

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

921686316 is a wasteful number, since it uses less digits than its factorization.

921686316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193873 (or 193871 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 921686316 is about 30359.2871457813. The cubic root of 921686316 is about 973.1826997870.

The spelling of 921686316 in words is "nine hundred twenty-one million, six hundred eighty-six thousand, three hundred sixteen".