18440444 has 48 divisors (see below), whose sum is σ = 37830240. Its totient is φ = 7772160.

The previous prime is 18440441. The next prime is 18440453. The reversal of 18440444 is 44404481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440441) 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, 66434 + ... + 66710.

It is an arithmetic number, because the mean of its divisors is an integer number (788130).

Almost surely, 2^18440444 is an apocalyptic number.

It is an amenable number.

18440444 is an abundant number, since it is smaller than the sum of its proper divisors (19389796).

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

18440444 is a wasteful number, since it uses less digits than its factorization.

18440444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 29.

The square root of 18440444 is about 4294.2338082596. The cubic root of 18440444 is about 264.1945115336.

The spelling of 18440444 in words is "eighteen million, four hundred forty thousand, four hundred forty-four".