18938144 has 24 divisors (see below), whose sum is σ = 37639728. Its totient is φ = 9378880.

The previous prime is 18938141. The next prime is 18938147. The reversal of 18938144 is 44183981.

It is an interprime number because it is at equal distance from previous prime (18938141) and next prime (18938147).

It is a junction number, because it is equal to n+sod(n) for n = 18938098 and 18938107.

It is not an unprimeable number, because it can be changed into a prime (18938141) 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, 659 + ... + 6189.

It is an arithmetic number, because the mean of its divisors is an integer number (1568322).

Almost surely, 2^18938144 is an apocalyptic number.

It is an amenable number.

18938144 is a deficient number, since it is larger than the sum of its proper divisors (18701584).

18938144 is a wasteful number, since it uses less digits than its factorization.

18938144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5648 (or 5640 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 18938144 is about 4351.7977894199. The cubic root of 18938144 is about 266.5502769856.

The spelling of 18938144 in words is "eighteen million, nine hundred thirty-eight thousand, one hundred forty-four".