18306444 has 48 divisors (see below), whose sum is σ = 46287360. Its totient is φ = 5597760.

The previous prime is 18306419. The next prime is 18306451. The reversal of 18306444 is 44460381.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37039 + ... + 37529.

It is an arithmetic number, because the mean of its divisors is an integer number (964320).

Almost surely, 2^18306444 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 18306444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23143680).

18306444 is an abundant number, since it is smaller than the sum of its proper divisors (27980916).

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

18306444 is a wasteful number, since it uses less digits than its factorization.

18306444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 18306444 is about 4278.6030430504. The cubic root of 18306444 is about 263.5530200431.

The spelling of 18306444 in words is "eighteen million, three hundred six thousand, four hundred forty-four".