18039149 has 2 divisors, whose sum is σ = 18039150. Its totient is φ = 18039148.

The previous prime is 18039127. The next prime is 18039163. The reversal of 18039149 is 94193081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 36100 = 4243^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 18039149 - 2¹² = 18035053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18039449) 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, 9019574 + 9019575.

It is an arithmetic number, because the mean of its divisors is an integer number (9019575).

Almost surely, 2^18039149 is an apocalyptic number.

It is an amenable number.

18039149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039149 is an equidigital number, since it uses as much as digits as its factorization.

18039149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 18039149 is about 4247.2519350752. The cubic root of 18039149 is about 262.2640007393.

The spelling of 18039149 in words is "eighteen million, thirty-nine thousand, one hundred forty-nine".