18722244 has 12 divisors (see below), whose sum is σ = 43685264. Its totient is φ = 6240744.

The previous prime is 18722191. The next prime is 18722267. The reversal of 18722244 is 44222781.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 780082 + ... + 780105.

Almost surely, 2^18722244 is an apocalyptic number.

It is an amenable number.

18722244 is an abundant number, since it is smaller than the sum of its proper divisors (24963020).

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

18722244 is a wasteful number, since it uses less digits than its factorization.

18722244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560194 (or 1560192 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 18722244 is about 4326.9208451276. The cubic root of 18722244 is about 265.5334879965.

The spelling of 18722244 in words is "eighteen million, seven hundred twenty-two thousand, two hundred forty-four".