18136439 has 2 divisors, whose sum is σ = 18136440. Its totient is φ = 18136438.

The previous prime is 18136421. The next prime is 18136463. The reversal of 18136439 is 93463181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18136439 - 2¹² = 18132343 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18136399 and 18136408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18136409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9068219 + 9068220.

It is an arithmetic number, because the mean of its divisors is an integer number (9068220).

Almost surely, 2^18136439 is an apocalyptic number.

18136439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18136439 is an equidigital number, since it uses as much as digits as its factorization.

18136439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 18136439 is about 4258.6898219992. The cubic root of 18136439 is about 262.7346425015.

The spelling of 18136439 in words is "eighteen million, one hundred thirty-six thousand, four hundred thirty-nine".