18214439 has 2 divisors, whose sum is σ = 18214440. Its totient is φ = 18214438.

The previous prime is 18214393. The next prime is 18214451. The reversal of 18214439 is 93441281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18214439 - 2¹² = 18210343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18214039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107219 + 9107220.

It is an arithmetic number, because the mean of its divisors is an integer number (9107220).

Almost surely, 2^18214439 is an apocalyptic number.

18214439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18214439 is an equidigital number, since it uses as much as digits as its factorization.

18214439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 18214439 is about 4267.8377429326. The cubic root of 18214439 is about 263.1107544340.

The spelling of 18214439 in words is "eighteen million, two hundred fourteen thousand, four hundred thirty-nine".