18108439 has 2 divisors, whose sum is σ = 18108440. Its totient is φ = 18108438.

The previous prime is 18108427. The next prime is 18108449. The reversal of 18108439 is 93480181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18108439 - 2¹⁷ = 17977367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18108449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054219 + 9054220.

It is an arithmetic number, because the mean of its divisors is an integer number (9054220).

Almost surely, 2^18108439 is an apocalyptic number.

18108439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18108439 is an equidigital number, since it uses as much as digits as its factorization.

18108439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18108439 is about 4255.4011561779. The cubic root of 18108439 is about 262.5993649522.

The spelling of 18108439 in words is "eighteen million, one hundred eight thousand, four hundred thirty-nine".