18985344 has 96 divisors (see below), whose sum is σ = 58721400. Its totient is φ = 5419008.

The previous prime is 18985339. The next prime is 18985367. The reversal of 18985344 is 44358981.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 18985296 and 18985305.

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, 18312 + ... + 19320.

Almost surely, 2^18985344 is an apocalyptic number.

18985344 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 18985344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29360700).

18985344 is an abundant number, since it is smaller than the sum of its proper divisors (39736056).

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

18985344 is a wasteful number, since it uses less digits than its factorization.

18985344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040 (or 1021 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 18985344 is about 4357.2174607196. The cubic root of 18985344 is about 266.7715365310.

The spelling of 18985344 in words is "eighteen million, nine hundred eighty-five thousand, three hundred forty-four".