18744189 has 8 divisors (see below), whose sum is σ = 25086240. Its totient is φ = 12449136.

The previous prime is 18744157. The next prime is 18744221. The reversal of 18744189 is 98144781.

It is an interprime number because it is at equal distance from previous prime (18744157) and next prime (18744221).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18744189 - 2⁵ = 18744157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18744189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18744109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10807 + ... + 12420.

It is an arithmetic number, because the mean of its divisors is an integer number (3135780).

Almost surely, 2^18744189 is an apocalyptic number.

It is an amenable number.

18744189 is a deficient number, since it is larger than the sum of its proper divisors (6342051).

18744189 is a wasteful number, since it uses less digits than its factorization.

18744189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23499.

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

The square root of 18744189 is about 4329.4559704425. The cubic root of 18744189 is about 265.6371945313.

The spelling of 18744189 in words is "eighteen million, seven hundred forty-four thousand, one hundred eighty-nine".