18039719 has 2 divisors, whose sum is σ = 18039720. Its totient is φ = 18039718.

The previous prime is 18039701. The next prime is 18039731. The reversal of 18039719 is 91793081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18039719 is a prime.

It is a super-2 number, since 2×18039719² = 650862923197922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18039739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019859 + 9019860.

It is an arithmetic number, because the mean of its divisors is an integer number (9019860).

Almost surely, 2^18039719 is an apocalyptic number.

18039719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039719 is an equidigital number, since it uses as much as digits as its factorization.

18039719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 18039719 is about 4247.3190367572. The cubic root of 18039719 is about 262.2667630445.

The spelling of 18039719 in words is "eighteen million, thirty-nine thousand, seven hundred nineteen".