18847944 has 64 divisors (see below), whose sum is σ = 53136000. Its totient is φ = 6189120.

The previous prime is 18847937. The next prime is 18847991. The reversal of 18847944 is 44974881.

It is a self number, because there is not a number n which added to its sum of digits gives 18847944.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14722 + ... + 15950.

It is an arithmetic number, because the mean of its divisors is an integer number (830250).

Almost surely, 2^18847944 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 18847944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26568000).

18847944 is an abundant number, since it is smaller than the sum of its proper divisors (34288056).

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

18847944 is a wasteful number, since it uses less digits than its factorization.

18847944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1305 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 18847944 is about 4341.4218868937. The cubic root of 18847944 is about 266.1264215238.

It can be divided in two parts, 18847 and 944, that added together give a palindrome (19791).

The spelling of 18847944 in words is "eighteen million, eight hundred forty-seven thousand, nine hundred forty-four".