18700189 has 2 divisors, whose sum is σ = 18700190. Its totient is φ = 18700188.

The previous prime is 18700183. The next prime is 18700211. The reversal of 18700189 is 98100781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 4884100 = 3717^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 18700189 - 2⁷ = 18700061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18700183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350094 + 9350095.

It is an arithmetic number, because the mean of its divisors is an integer number (9350095).

Almost surely, 2^18700189 is an apocalyptic number.

It is an amenable number.

18700189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18700189 is an equidigital number, since it uses as much as digits as its factorization.

18700189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 18700189 is about 4324.3715150297. The cubic root of 18700189 is about 265.4291799482.

The spelling of 18700189 in words is "eighteen million, seven hundred thousand, one hundred eighty-nine".