18039739 has 2 divisors, whose sum is σ = 18039740. Its totient is φ = 18039738.

The previous prime is 18039733. The next prime is 18039761. The reversal of 18039739 is 93793081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18039739 - 2³ = 18039731 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18039731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019869 + 9019870.

It is an arithmetic number, because the mean of its divisors is an integer number (9019870).

Almost surely, 2^18039739 is an apocalyptic number.

18039739 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039739 is an equidigital number, since it uses as much as digits as its factorization.

18039739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18039739 is about 4247.3213911829. The cubic root of 18039739 is about 262.2668599664.

The spelling of 18039739 in words is "eighteen million, thirty-nine thousand, seven hundred thirty-nine".