18139 has 8 divisors (see below), whose sum is σ = 21168. Its totient is φ = 15360.

The previous prime is 18133. The next prime is 18143. The reversal of 18139 is 93181.

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

It is a cyclic number.

It is not a de Polignac number, because 18139 - 2³ = 18131 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (18131) 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, 139 + ... + 235.

It is an arithmetic number, because the mean of its divisors is an integer number (2646).

2¹⁸¹³⁹ is an apocalyptic number.

18139 is a deficient number, since it is larger than the sum of its proper divisors (3029).

18139 is a wasteful number, since it uses less digits than its factorization.

18139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125.

The product of its digits is 216, while the sum is 22.

The square root of 18139 is about 134.6811048366. The cubic root of 18139 is about 26.2747008614.

The spelling of 18139 in words is "eighteen thousand, one hundred thirty-nine".