18288189 has 6 divisors (see below), whose sum is σ = 26416286. Its totient is φ = 12192120.

The previous prime is 18288143. The next prime is 18288191. The reversal of 18288189 is 98188281.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 3404025 = 3858^2 + 1845^2 .

It is not a de Polignac number, because 18288189 - 2⁸ = 18287933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18288199) 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 5 ways as a sum of consecutive naturals, for example, 1016002 + ... + 1016019.

Almost surely, 2^18288189 is an apocalyptic number.

It is an amenable number.

18288189 is a deficient number, since it is larger than the sum of its proper divisors (8128097).

18288189 is a wasteful number, since it uses less digits than its factorization.

18288189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032027 (or 2032024 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The square root of 18288189 is about 4276.4692212151. The cubic root of 18288189 is about 263.4653867761.

The spelling of 18288189 in words is "eighteen million, two hundred eighty-eight thousand, one hundred eighty-nine".