18427239 has 6 divisors (see below), whose sum is σ = 26617136. Its totient is φ = 12284820.

The previous prime is 18427223. The next prime is 18427259. The reversal of 18427239 is 93272481.

It is not a de Polignac number, because 18427239 - 2⁴ = 18427223 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 (18427259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1023727 + ... + 1023744.

Almost surely, 2^18427239 is an apocalyptic number.

18427239 is a deficient number, since it is larger than the sum of its proper divisors (8189897).

18427239 is a wasteful number, since it uses less digits than its factorization.

18427239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047477 (or 2047474 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18427239 is about 4292.6960060083. The cubic root of 18427239 is about 264.1314342094.

The spelling of 18427239 in words is "eighteen million, four hundred twenty-seven thousand, two hundred thirty-nine".