18000439 has 2 divisors, whose sum is σ = 18000440. Its totient is φ = 18000438.

The previous prime is 18000407. The next prime is 18000457. The reversal of 18000439 is 93400081.

It is a strong prime.

It is an emirp because it is prime and its reverse (93400081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18000439 - 2⁵ = 18000407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18000469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000219 + 9000220.

It is an arithmetic number, because the mean of its divisors is an integer number (9000220).

Almost surely, 2^18000439 is an apocalyptic number.

18000439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000439 is an equidigital number, since it uses as much as digits as its factorization.

18000439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18000439 is about 4242.6924234500. The cubic root of 18000439 is about 262.0762699693.

The spelling of 18000439 in words is "eighteen million, four hundred thirty-nine", and thus it is an aban number.