18934189 has 2 divisors, whose sum is σ = 18934190. Its totient is φ = 18934188.

The previous prime is 18934177. The next prime is 18934199. The reversal of 18934189 is 98143981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18852964 + 81225 = 4342^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 18934189 - 2¹¹ = 18932141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18934199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9467094 + 9467095.

It is an arithmetic number, because the mean of its divisors is an integer number (9467095).

Almost surely, 2^18934189 is an apocalyptic number.

It is an amenable number.

18934189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18934189 is an equidigital number, since it uses as much as digits as its factorization.

18934189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 18934189 is about 4351.3433557926. The cubic root of 18934189 is about 266.5317204375.

The spelling of 18934189 in words is "eighteen million, nine hundred thirty-four thousand, one hundred eighty-nine".