18738944 has 36 divisors (see below), whose sum is σ = 42752304. Its totient is φ = 8030208.

The previous prime is 18738943. The next prime is 18738961. The reversal of 18738944 is 44983781.

It is a super-2 number, since 2×18738944² = 702296044470272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18738895 and 18738904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3437 + ... + 7020.

It is an arithmetic number, because the mean of its divisors is an integer number (1187564).

Almost surely, 2^18738944 is an apocalyptic number.

18738944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18738944 is an abundant number, since it is smaller than the sum of its proper divisors (24013360).

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

18738944 is an equidigital number, since it uses as much as digits as its factorization.

18738944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10480 (or 10466 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 18738944 is about 4328.8501937582. The cubic root of 18738944 is about 265.6124153484.

The spelling of 18738944 in words is "eighteen million, seven hundred thirty-eight thousand, nine hundred forty-four".