18722544 has 80 divisors (see below), whose sum is σ = 50806272. Its totient is φ = 5935104.

The previous prime is 18722513. The next prime is 18722549. The reversal of 18722544 is 44522781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96912 + ... + 97104.

Almost surely, 2^18722544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18722544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25403136).

18722544 is an abundant number, since it is smaller than the sum of its proper divisors (32083728).

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

18722544 is a wasteful number, since it uses less digits than its factorization.

18722544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 288 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 18722544 is about 4326.9555116733. The cubic root of 18722544 is about 265.5349062670.

The spelling of 18722544 in words is "eighteen million, seven hundred twenty-two thousand, five hundred forty-four".