18439344 has 120 divisors (see below), whose sum is σ = 64376832. Its totient is φ = 4786560.

The previous prime is 18439321. The next prime is 18439349. The reversal of 18439344 is 44393481.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 18439299 and 18439308.

It is not an unprimeable number, because it can be changed into a prime (18439349) 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 23 ways as a sum of consecutive naturals, for example, 10257 + ... + 11919.

Almost surely, 2^18439344 is an apocalyptic number.

18439344 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 18439344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32188416).

18439344 is an abundant number, since it is smaller than the sum of its proper divisors (45937488).

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

18439344 is a wasteful number, since it uses less digits than its factorization.

18439344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695 (or 1686 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 18439344 is about 4294.1057276225. The cubic root of 18439344 is about 264.1892582302.

The spelling of 18439344 in words is "eighteen million, four hundred thirty-nine thousand, three hundred forty-four".