18685044 has 72 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 5234112.

The previous prime is 18685003. The next prime is 18685049. The reversal of 18685044 is 44058681.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12657 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (764400).

Almost surely, 2^18685044 is an apocalyptic number.

18685044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18685044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27518400).

18685044 is an abundant number, since it is smaller than the sum of its proper divisors (36351756).

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

18685044 is a wasteful number, since it uses less digits than its factorization.

18685044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 18685044 is about 4322.6200388190. The cubic root of 18685044 is about 265.3575049035.

The spelling of 18685044 in words is "eighteen million, six hundred eighty-five thousand, forty-four".