18027239 has 4 divisors (see below), whose sum is σ = 18811056. Its totient is φ = 17243424.

The previous prime is 18027227. The next prime is 18027271. The reversal of 18027239 is 93272081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18027239 - 2⁴ = 18027223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18027209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391874 + ... + 391919.

It is an arithmetic number, because the mean of its divisors is an integer number (4702764).

Almost surely, 2^18027239 is an apocalyptic number.

18027239 is a deficient number, since it is larger than the sum of its proper divisors (783817).

18027239 is an equidigital number, since it uses as much as digits as its factorization.

18027239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783816.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18027239 is about 4245.8496205118. The cubic root of 18027239 is about 262.2062697837.

The spelling of 18027239 in words is "eighteen million, twenty-seven thousand, two hundred thirty-nine".