18094189 has 4 divisors (see below), whose sum is σ = 18102780. Its totient is φ = 18085600.

The previous prime is 18094183. The next prime is 18094199. The reversal of 18094189 is 98149081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98149081 = 1657 ⋅59233.

It can be written as a sum of positive squares in 2 ways, for example, as 10017225 + 8076964 = 3165^2 + 2842^2 .

It is a cyclic number.

It is not a de Polignac number, because 18094189 - 2⁵ = 18094157 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18094183) 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, 1257 + ... + 6145.

It is an arithmetic number, because the mean of its divisors is an integer number (4525695).

Almost surely, 2^18094189 is an apocalyptic number.

It is an amenable number.

18094189 is a deficient number, since it is larger than the sum of its proper divisors (8591).

18094189 is an equidigital number, since it uses as much as digits as its factorization.

18094189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8590.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18094189 is about 4253.7264839197. The cubic root of 18094189 is about 262.5304647938.

The spelling of 18094189 in words is "eighteen million, ninety-four thousand, one hundred eighty-nine".