18858944 has 56 divisors (see below), whose sum is σ = 42458640. Its totient is φ = 8239104.

The previous prime is 18858929. The next prime is 18858947. The reversal of 18858944 is 44985881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18858947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15212 + ... + 16404.

It is an arithmetic number, because the mean of its divisors is an integer number (758190).

Almost surely, 2^18858944 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 18858944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21229320).

18858944 is an abundant number, since it is smaller than the sum of its proper divisors (23599696).

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

18858944 is a wasteful number, since it uses less digits than its factorization.

18858944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237 (or 1227 counting only the distinct ones).

The product of its digits is 368640, while the sum is 47.

The square root of 18858944 is about 4342.6885681568. The cubic root of 18858944 is about 266.1781835149.

The spelling of 18858944 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred forty-four".