18539484239 has 4 divisors (see below), whose sum is σ = 18544832040. Its totient is φ = 18534136440.

The previous prime is 18539484209. The next prime is 18539484241. The reversal of 18539484239 is 93248493581.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18539484239 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 (18539484209) 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 3 ways as a sum of consecutive naturals, for example, 2668697 + ... + 2675634.

It is an arithmetic number, because the mean of its divisors is an integer number (4636208010).

Almost surely, 2^18539484239 is an apocalyptic number.

18539484239 is a deficient number, since it is larger than the sum of its proper divisors (5347801).

18539484239 is an equidigital number, since it uses as much as digits as its factorization.

18539484239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5347800.

The product of its digits is 7464960, while the sum is 56.

The spelling of 18539484239 in words is "eighteen billion, five hundred thirty-nine million, four hundred eighty-four thousand, two hundred thirty-nine".