18342239 has 8 divisors (see below), whose sum is σ = 19974000. Its totient is φ = 16777152.

The previous prime is 18342223. The next prime is 18342251. The reversal of 18342239 is 93224381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18342239 - 2⁴ = 18342223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18392239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16094 + ... + 17195.

It is an arithmetic number, because the mean of its divisors is an integer number (2496750).

Almost surely, 2^18342239 is an apocalyptic number.

18342239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18342239 is a deficient number, since it is larger than the sum of its proper divisors (1631761).

18342239 is a wasteful number, since it uses less digits than its factorization.

18342239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33337.

The product of its digits is 10368, while the sum is 32.

The square root of 18342239 is about 4282.7840244402. The cubic root of 18342239 is about 263.7246852458.

It can be divided in two parts, 18342 and 239, that added together give a palindrome (18581).

The spelling of 18342239 in words is "eighteen million, three hundred forty-two thousand, two hundred thirty-nine".