18238039 has 2 divisors, whose sum is σ = 18238040. Its totient is φ = 18238038.

The previous prime is 18238009. The next prime is 18238067. The reversal of 18238039 is 93083281.

It is a strong prime.

It is an emirp because it is prime and its reverse (93083281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18238039 - 2⁵ = 18238007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18237995 and 18238013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18238009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119019 + 9119020.

It is an arithmetic number, because the mean of its divisors is an integer number (9119020).

Almost surely, 2^18238039 is an apocalyptic number.

18238039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238039 is an equidigital number, since it uses as much as digits as its factorization.

18238039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18238039 is about 4270.6017140445. The cubic root of 18238039 is about 263.2243407659.

The spelling of 18238039 in words is "eighteen million, two hundred thirty-eight thousand, thirty-nine".