18306839 has 2 divisors, whose sum is σ = 18306840. Its totient is φ = 18306838.

The previous prime is 18306809. The next prime is 18306887. The reversal of 18306839 is 93860381.

It is a weak prime.

It is an emirp because it is prime and its reverse (93860381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18306839 - 2⁸ = 18306583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18306809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9153419 + 9153420.

It is an arithmetic number, because the mean of its divisors is an integer number (9153420).

Almost surely, 2^18306839 is an apocalyptic number.

18306839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18306839 is an equidigital number, since it uses as much as digits as its factorization.

18306839 is an evil number, because the sum of its binary digits is even.

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

The square root of 18306839 is about 4278.6492027274. The cubic root of 18306839 is about 263.5549155995.

The spelling of 18306839 in words is "eighteen million, three hundred six thousand, eight hundred thirty-nine".