18340344 has 160 divisors (see below), whose sum is σ = 58544640. Its totient is φ = 5313600.

The previous prime is 18340307. The next prime is 18340349. The reversal of 18340344 is 44304381.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340349) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 220927 + ... + 221009.

It is an arithmetic number, because the mean of its divisors is an integer number (365904).

Almost surely, 2^18340344 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 18340344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29272320).

18340344 is an abundant number, since it is smaller than the sum of its proper divisors (40204296).

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

18340344 is a wasteful number, since it uses less digits than its factorization.

18340344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 18340344 is about 4282.5627841282. The cubic root of 18340344 is about 263.7156028307.

The spelling of 18340344 in words is "eighteen million, three hundred forty thousand, three hundred forty-four".