18039929 has 2 divisors, whose sum is σ = 18039930. Its totient is φ = 18039928.

The previous prime is 18039883. The next prime is 18039953. The reversal of 18039929 is 92993081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 1106704 = 4115^2 + 1052^2 .

It is an emirp because it is prime and its reverse (92993081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18039929 - 2⁸ = 18039673 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (18039029) 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, 9019964 + 9019965.

It is an arithmetic number, because the mean of its divisors is an integer number (9019965).

Almost surely, 2^18039929 is an apocalyptic number.

It is an amenable number.

18039929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039929 is an equidigital number, since it uses as much as digits as its factorization.

18039929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 18039929 is about 4247.3437581623. The cubic root of 18039929 is about 262.2677807212.

The spelling of 18039929 in words is "eighteen million, thirty-nine thousand, nine hundred twenty-nine".