18815339839 has 8 divisors (see below), whose sum is σ = 18956013408. Its totient is φ = 18674714880.

The previous prime is 18815339833. The next prime is 18815339843. The reversal of 18815339839 is 93893351881.

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 18815339839 - 2²⁷ = 18681122111 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 (18815339833) 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, 1244254 + ... + 1259284.

It is an arithmetic number, because the mean of its divisors is an integer number (2369501676).

Almost surely, 2^18815339839 is an apocalyptic number.

18815339839 is a deficient number, since it is larger than the sum of its proper divisors (140673569).

18815339839 is a wasteful number, since it uses less digits than its factorization.

18815339839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24305.

The product of its digits is 5598720, while the sum is 58.

The spelling of 18815339839 in words is "eighteen billion, eight hundred fifteen million, three hundred thirty-nine thousand, eight hundred thirty-nine".