18530239 has 16 divisors (see below), whose sum is σ = 22969408. Its totient is φ = 14556672.

The previous prime is 18530233. The next prime is 18530251. The reversal of 18530239 is 93203581.

It is a happy number.

It is not a de Polignac number, because 18530239 - 2⁵ = 18530207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18530239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18530233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13639 + ... + 14935.

It is an arithmetic number, because the mean of its divisors is an integer number (1435588).

Almost surely, 2^18530239 is an apocalyptic number.

18530239 is a deficient number, since it is larger than the sum of its proper divisors (4439169).

18530239 is a wasteful number, since it uses less digits than its factorization.

18530239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 18530239 is about 4304.6764106028. The cubic root of 18530239 is about 264.6226455375.

It can be divided in two parts, 18530 and 239, that added together give a square (18769 = 137²).

The spelling of 18530239 in words is "eighteen million, five hundred thirty thousand, two hundred thirty-nine".