18744489 has 24 divisors (see below), whose sum is σ = 28975752. Its totient is φ = 11635200.

The previous prime is 18744487. The next prime is 18744529. The reversal of 18744489 is 98444781.

It can be written as a sum of positive squares in 4 ways, for example, as 4995225 + 13749264 = 2235^2 + 3708^2 .

It is not a de Polignac number, because 18744489 - 2¹ = 18744487 is a prime.

It is a super-2 number, since 2×18744489² = 702711735742242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18744487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14847 + ... + 16059.

It is an arithmetic number, because the mean of its divisors is an integer number (1207323).

Almost surely, 2^18744489 is an apocalyptic number.

It is an amenable number.

18744489 is a deficient number, since it is larger than the sum of its proper divisors (10231263).

18744489 is a wasteful number, since it uses less digits than its factorization.

18744489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1334 counting only the distinct ones).

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

The square root of 18744489 is about 4329.4906166892. The cubic root of 18744489 is about 265.6386116946.

The spelling of 18744489 in words is "eighteen million, seven hundred forty-four thousand, four hundred eighty-nine".