18520396239 has 8 divisors (see below), whose sum is σ = 25112401920. Its totient is φ = 12137660696.

The previous prime is 18520396229. The next prime is 18520396249. The reversal of 18520396239 is 93269302581.

It is an interprime number because it is at equal distance from previous prime (18520396229) and next prime (18520396249).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520396239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520396229) 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, 52317327 + ... + 52317680.

It is an arithmetic number, because the mean of its divisors is an integer number (3139050240).

Almost surely, 2^18520396239 is an apocalyptic number.

18520396239 is a deficient number, since it is larger than the sum of its proper divisors (6592005681).

18520396239 is a wasteful number, since it uses less digits than its factorization.

18520396239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104635069.

The product of its (nonzero) digits is 699840, while the sum is 48.

The spelling of 18520396239 in words is "eighteen billion, five hundred twenty million, three hundred ninety-six thousand, two hundred thirty-nine".