21738792 has 16 divisors (see below), whose sum is σ = 54347040. Its totient is φ = 7246256.

The previous prime is 21738763. The next prime is 21738803. The reversal of 21738792 is 29783712.

It is a self number, because there is not a number n which added to its sum of digits gives 21738792.

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, 452868 + ... + 452915.

It is an arithmetic number, because the mean of its divisors is an integer number (3396690).

Almost surely, 2^21738792 is an apocalyptic number.

It is an amenable number.

21738792 is an abundant number, since it is smaller than the sum of its proper divisors (32608248).

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

21738792 is a wasteful number, since it uses less digits than its factorization.

21738792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905792 (or 905788 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 21738792 is about 4662.4877479732. The cubic root of 21738792 is about 279.0905526909.

The spelling of 21738792 in words is "twenty-one million, seven hundred thirty-eight thousand, seven hundred ninety-two".