921872394 has 32 divisors (see below), whose sum is σ = 2049608640. Its totient is φ = 307140336.

The previous prime is 921872339. The next prime is 921872401. The reversal of 921872394 is 493278129.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189132 + ... + 193944.

It is an arithmetic number, because the mean of its divisors is an integer number (64050270).

Almost surely, 2^921872394 is an apocalyptic number.

921872394 is an abundant number, since it is smaller than the sum of its proper divisors (1127736246).

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

921872394 is a wasteful number, since it uses less digits than its factorization.

921872394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8371 (or 8365 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 921872394 is about 30362.3515887686. The cubic root of 921872394 is about 973.2481868919.

The spelling of 921872394 in words is "nine hundred twenty-one million, eight hundred seventy-two thousand, three hundred ninety-four".