18720338439 has 16 divisors (see below), whose sum is σ = 27240505344. Its totient is φ = 11341108800.

The previous prime is 18720338437. The next prime is 18720338453. The reversal of 18720338439 is 93483302781.

It is not a de Polignac number, because 18720338439 - 2¹ = 18720338437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18720338437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29319 + ... + 195704.

It is an arithmetic number, because the mean of its divisors is an integer number (1702531584).

Almost surely, 2^18720338439 is an apocalyptic number.

18720338439 is a deficient number, since it is larger than the sum of its proper divisors (8520166905).

18720338439 is a wasteful number, since it uses less digits than its factorization.

18720338439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227558.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 18720338439 in words is "eighteen billion, seven hundred twenty million, three hundred thirty-eight thousand, four hundred thirty-nine".