18189744 has 20 divisors (see below), whose sum is σ = 46990296. Its totient is φ = 6063232.

The previous prime is 18189727. The next prime is 18189751. The reversal of 18189744 is 44798181.

It is a junction number, because it is equal to n+sod(n) for n = 18189696 and 18189705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189429 + ... + 189524.

Almost surely, 2^18189744 is an apocalyptic number.

It is an amenable number.

18189744 is an abundant number, since it is smaller than the sum of its proper divisors (28800552).

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

18189744 is a wasteful number, since it uses less digits than its factorization.

18189744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378964 (or 378958 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 18189744 is about 4264.9436104127. The cubic root of 18189744 is about 262.9917927918.

The spelling of 18189744 in words is "eighteen million, one hundred eighty-nine thousand, seven hundred forty-four".