18612189 has 12 divisors (see below), whose sum is σ = 26998972. Its totient is φ = 12355200.

The previous prime is 18612157. The next prime is 18612211. The reversal of 18612189 is 98121681.

It can be written as a sum of positive squares in 2 ways, for example, as 4796100 + 13816089 = 2190^2 + 3717^2 .

It is not a de Polignac number, because 18612189 - 2⁵ = 18612157 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 (18612119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2122 + ... + 6459.

Almost surely, 2^18612189 is an apocalyptic number.

It is an amenable number.

18612189 is a deficient number, since it is larger than the sum of its proper divisors (8386783).

18612189 is a wasteful number, since it uses less digits than its factorization.

18612189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8828 (or 8825 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 18612189 is about 4314.1846274818. The cubic root of 18612189 is about 265.0121698458.

The spelling of 18612189 in words is "eighteen million, six hundred twelve thousand, one hundred eighty-nine".