18444144 has 20 divisors (see below), whose sum is σ = 47647496. Its totient is φ = 6148032.

The previous prime is 18444121. The next prime is 18444157. The reversal of 18444144 is 44144481.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 192079 + ... + 192174.

Almost surely, 2^18444144 is an apocalyptic number.

It is an amenable number.

18444144 is an abundant number, since it is smaller than the sum of its proper divisors (29203352).

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

18444144 is a wasteful number, since it uses less digits than its factorization.

18444144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384264 (or 384258 counting only the distinct ones).

The product of its digits is 8192, while the sum is 30.

The square root of 18444144 is about 4294.6645969156. The cubic root of 18444144 is about 264.2121802029.

The spelling of 18444144 in words is "eighteen million, four hundred forty-four thousand, one hundred forty-four".