21792746 has 16 divisors (see below), whose sum is σ = 33936840. Its totient is φ = 10483200.

The previous prime is 21792733. The next prime is 21792761. The reversal of 21792746 is 64729712.

It can be written as a sum of positive squares in 4 ways, for example, as 19704721 + 2088025 = 4439^2 + 1445^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22790 + ... + 23726.

Almost surely, 2^21792746 is an apocalyptic number.

21792746 is a deficient number, since it is larger than the sum of its proper divisors (12144094).

21792746 is a wasteful number, since it uses less digits than its factorization.

21792746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369.

The product of its digits is 42336, while the sum is 38.

The square root of 21792746 is about 4668.2701292877. The cubic root of 21792746 is about 279.3212556540.

The spelling of 21792746 in words is "twenty-one million, seven hundred ninety-two thousand, seven hundred forty-six".