21938792 has 16 divisors (see below), whose sum is σ = 41231040. Its totient is φ = 10943856.

The previous prime is 21938779. The next prime is 21938831. The reversal of 21938792 is 29783912.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (2576940).

Almost surely, 2^21938792 is an apocalyptic number.

It is an amenable number.

21938792 is a deficient number, since it is larger than the sum of its proper divisors (19292248).

21938792 is a wasteful number, since it uses less digits than its factorization.

21938792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392 (or 6388 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 21938792 is about 4683.8864204846. The cubic root of 21938792 is about 279.9438322710.

The spelling of 21938792 in words is "twenty-one million, nine hundred thirty-eight thousand, seven hundred ninety-two".