18748444 has 48 divisors (see below), whose sum is σ = 39160800. Its totient is φ = 7741440.

The previous prime is 18748417. The next prime is 18748447. The reversal of 18748444 is 44484781.

It is a super-2 number, since 2×18748444² = 703008304842272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18748397 and 18748406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18748447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41532 + ... + 41980.

It is an arithmetic number, because the mean of its divisors is an integer number (815850).

Almost surely, 2^18748444 is an apocalyptic number.

It is an amenable number.

18748444 is an abundant number, since it is smaller than the sum of its proper divisors (20412356).

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

18748444 is a wasteful number, since it uses less digits than its factorization.

18748444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 548 counting only the distinct ones).

The product of its digits is 114688, while the sum is 40.

The square root of 18748444 is about 4329.9473437907. The cubic root of 18748444 is about 265.6572932180.

The spelling of 18748444 in words is "eighteen million, seven hundred forty-eight thousand, four hundred forty-four".