18229439 has 2 divisors, whose sum is σ = 18229440. Its totient is φ = 18229438.

The previous prime is 18229411. The next prime is 18229441. The reversal of 18229439 is 93492281.

It is a strong prime.

It is an emirp because it is prime and its reverse (93492281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18229439 - 2²⁴ = 1452223 is a prime.

Together with 18229441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18229459) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114719 + 9114720.

It is an arithmetic number, because the mean of its divisors is an integer number (9114720).

Almost surely, 2^18229439 is an apocalyptic number.

18229439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18229439 is an equidigital number, since it uses as much as digits as its factorization.

18229439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 18229439 is about 4269.5947114451. The cubic root of 18229439 is about 263.1829604903.

The spelling of 18229439 in words is "eighteen million, two hundred twenty-nine thousand, four hundred thirty-nine".