18844544 has 64 divisors (see below), whose sum is σ = 40465440. Its totient is φ = 8718336.

The previous prime is 18844537. The next prime is 18844549. The reversal of 18844544 is 44544881.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 18844498 and 18844507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18844549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108842 + ... + 109014.

Almost surely, 2^18844544 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 18844544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20232720).

18844544 is an abundant number, since it is smaller than the sum of its proper divisors (21620896).

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

18844544 is a wasteful number, since it uses less digits than its factorization.

18844544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 235 counting only the distinct ones).

The product of its digits is 81920, while the sum is 38.

The square root of 18844544 is about 4341.0302924536. The cubic root of 18844544 is about 266.1104182886.

The spelling of 18844544 in words is "eighteen million, eight hundred forty-four thousand, five hundred forty-four".