18055544 has 32 divisors (see below), whose sum is σ = 36750000. Its totient is φ = 8266752.

The previous prime is 18055517. The next prime is 18055553. The reversal of 18055544 is 44555081.

It is a self number, because there is not a number n which added to its sum of digits gives 18055544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13832 + ... + 15080.

Almost surely, 2^18055544 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 18055544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18375000).

18055544 is an abundant number, since it is smaller than the sum of its proper divisors (18694456).

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

18055544 is a wasteful number, since it uses less digits than its factorization.

18055544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407 (or 1403 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 18055544 is about 4249.1815682552. The cubic root of 18055544 is about 262.3434301386.

The spelling of 18055544 in words is "eighteen million, fifty-five thousand, five hundred forty-four".