18389149 has 2 divisors, whose sum is σ = 18389150. Its totient is φ = 18389148.

The previous prime is 18389143. The next prime is 18389153. The reversal of 18389149 is 94198381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10936249 + 7452900 = 3307^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 18389149 - 2³ = 18389141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18389141) 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, 9194574 + 9194575.

It is an arithmetic number, because the mean of its divisors is an integer number (9194575).

Almost surely, 2^18389149 is an apocalyptic number.

It is an amenable number.

18389149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18389149 is an equidigital number, since it uses as much as digits as its factorization.

18389149 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18389149 is about 4288.2571051652. The cubic root of 18389149 is about 263.9493178266.

The spelling of 18389149 in words is "eighteen million, three hundred eighty-nine thousand, one hundred forty-nine".