18328439 has 2 divisors, whose sum is σ = 18328440. Its totient is φ = 18328438.

The previous prime is 18328403. The next prime is 18328451. The reversal of 18328439 is 93482381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18328439 - 2¹² = 18324343 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18328039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164219 + 9164220.

It is an arithmetic number, because the mean of its divisors is an integer number (9164220).

Almost surely, 2^18328439 is an apocalyptic number.

18328439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328439 is an equidigital number, since it uses as much as digits as its factorization.

18328439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 18328439 is about 4281.1726197387. The cubic root of 18328439 is about 263.6585298589.

The spelling of 18328439 in words is "eighteen million, three hundred twenty-eight thousand, four hundred thirty-nine".