18002189 has 2 divisors, whose sum is σ = 18002190. Its totient is φ = 18002188.

The previous prime is 18002161. The next prime is 18002233. The reversal of 18002189 is 98120081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 779689 = 4150^2 + 883^2 .

It is a cyclic number.

It is not a de Polignac number, because 18002189 - 2¹² = 17998093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18002129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9001094 + 9001095.

It is an arithmetic number, because the mean of its divisors is an integer number (9001095).

Almost surely, 2^18002189 is an apocalyptic number.

It is an amenable number.

18002189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18002189 is an equidigital number, since it uses as much as digits as its factorization.

18002189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 18002189 is about 4242.8986554006. The cubic root of 18002189 is about 262.0847626994.

The spelling of 18002189 in words is "eighteen million, two thousand, one hundred eighty-nine".