18859344 has 120 divisors (see below), whose sum is σ = 58621248. Its totient is φ = 5114880.

The previous prime is 18859339. The next prime is 18859349. The reversal of 18859344 is 44395881.

It is an interprime number because it is at equal distance from previous prime (18859339) and next prime (18859349).

It is a super-2 number, since 2×18859344² = 711349712220672, which contains 22 as substring.

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

Its product of digits (138240) is a multiple of the sum of its prime divisors (90).

It is a junction number, because it is equal to n+sod(n) for n = 18859296 and 18859305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18859349) 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, 459964 + ... + 460004.

Almost surely, 2^18859344 is an apocalyptic number.

18859344 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 18859344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29310624).

18859344 is an abundant number, since it is smaller than the sum of its proper divisors (39761904).

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

18859344 is a wasteful number, since it uses less digits than its factorization.

18859344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 90 counting only the distinct ones).

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

The square root of 18859344 is about 4342.7346223319. The cubic root of 18859344 is about 266.1800653899.

The spelling of 18859344 in words is "eighteen million, eight hundred fifty-nine thousand, three hundred forty-four".