18444188 has 36 divisors (see below), whose sum is σ = 37873080. Its totient is φ = 7836192.

The previous prime is 18444169. The next prime is 18444211. The reversal of 18444188 is 88144481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26906 + ... + 27582.

It is an arithmetic number, because the mean of its divisors is an integer number (1052030).

Almost surely, 2^18444188 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 18444188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18936540).

18444188 is an abundant number, since it is smaller than the sum of its proper divisors (19428892).

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

18444188 is a wasteful number, since it uses less digits than its factorization.

18444188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 825 counting only the distinct ones).

The product of its digits is 32768, while the sum is 38.

The square root of 18444188 is about 4294.6697195477. The cubic root of 18444188 is about 264.2123903026.

The spelling of 18444188 in words is "eighteen million, four hundred forty-four thousand, one hundred eighty-eight".