18140189 has 2 divisors, whose sum is σ = 18140190. Its totient is φ = 18140188.

The previous prime is 18140179. The next prime is 18140191. The reversal of 18140189 is 98104181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15077689 + 3062500 = 3883^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 18140189 - 2²⁴ = 1362973 is a prime.

Together with 18140191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18140159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070094 + 9070095.

It is an arithmetic number, because the mean of its divisors is an integer number (9070095).

Almost surely, 2^18140189 is an apocalyptic number.

It is an amenable number.

18140189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140189 is an equidigital number, since it uses as much as digits as its factorization.

18140189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18140189 is about 4259.1300754966. The cubic root of 18140189 is about 262.7527494557.

The spelling of 18140189 in words is "eighteen million, one hundred forty thousand, one hundred eighty-nine".