18621344 has 48 divisors (see below), whose sum is σ = 42638400. Its totient is φ = 7839744.

The previous prime is 18621331. The next prime is 18621367. The reversal of 18621344 is 44312681.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12512 + ... + 13920.

It is an arithmetic number, because the mean of its divisors is an integer number (888300).

Almost surely, 2^18621344 is an apocalyptic number.

18621344 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 18621344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21319200).

18621344 is an abundant number, since it is smaller than the sum of its proper divisors (24017056).

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

18621344 is a wasteful number, since it uses less digits than its factorization.

18621344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485 (or 1477 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 18621344 is about 4315.2455318325. The cubic root of 18621344 is about 265.0556142918.

The spelling of 18621344 in words is "eighteen million, six hundred twenty-one thousand, three hundred forty-four".