921491884 has 12 divisors (see below), whose sum is σ = 1613347344. Its totient is φ = 460535504.

The previous prime is 921491873. The next prime is 921491891. The reversal of 921491884 is 488194129.

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, 42544 + ... + 60439.

It is an arithmetic number, because the mean of its divisors is an integer number (134445612).

Almost surely, 2^921491884 is an apocalyptic number.

It is an amenable number.

921491884 is a deficient number, since it is larger than the sum of its proper divisors (691855460).

921491884 is a wasteful number, since it uses less digits than its factorization.

921491884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105224 (or 105222 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 921491884 is about 30356.0847936620. The cubic root of 921491884 is about 973.1142632115.

The spelling of 921491884 in words is "nine hundred twenty-one million, four hundred ninety-one thousand, eight hundred eighty-four".