18445884 has 48 divisors (see below), whose sum is σ = 47980800. Its totient is φ = 5481216.

The previous prime is 18445883. The next prime is 18445897. The reversal of 18445884 is 48854481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18445883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497 + ... + 6255.

It is an arithmetic number, because the mean of its divisors is an integer number (999600).

Almost surely, 2^18445884 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 18445884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23990400).

18445884 is an abundant number, since it is smaller than the sum of its proper divisors (29534916).

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

18445884 is a wasteful number, since it uses less digits than its factorization.

18445884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4802 (or 4800 counting only the distinct ones).

The product of its digits is 163840, while the sum is 42.

The square root of 18445884 is about 4294.8671690752. The cubic root of 18445884 is about 264.2204884359.

The spelling of 18445884 in words is "eighteen million, four hundred forty-five thousand, eight hundred eighty-four".