21894792 has 32 divisors (see below), whose sum is σ = 55144800. Its totient is φ = 7243904.

The previous prime is 21894751. The next prime is 21894839. The reversal of 21894792 is 29749812.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 42 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (1723275).

Almost surely, 2^21894792 is an apocalyptic number.

It is an amenable number.

21894792 is an abundant number, since it is smaller than the sum of its proper divisors (33250008).

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

21894792 is a wasteful number, since it uses less digits than its factorization.

21894792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805 (or 6801 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 21894792 is about 4679.1871088897. The cubic root of 21894792 is about 279.7565571101.

The spelling of 21894792 in words is "twenty-one million, eight hundred ninety-four thousand, seven hundred ninety-two".