18089244 has 60 divisors (see below), whose sum is σ = 48841408. Its totient is φ = 5832000.

The previous prime is 18089237. The next prime is 18089257. The reversal of 18089244 is 44298081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18089199 and 18089208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9144 + ... + 10944.

Almost surely, 2^18089244 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 18089244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24420704).

18089244 is an abundant number, since it is smaller than the sum of its proper divisors (30752164).

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

18089244 is a wasteful number, since it uses less digits than its factorization.

18089244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1837 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18089244 is about 4253.1451891512. The cubic root of 18089244 is about 262.5065467755.

The spelling of 18089244 in words is "eighteen million, eighty-nine thousand, two hundred forty-four".