18128378839 has 4 divisors (see below), whose sum is σ = 18248434480. Its totient is φ = 18008323200.

The previous prime is 18128378837. The next prime is 18128378869. The reversal of 18128378839 is 93887382181.

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

It is a cyclic number.

It is not a de Polignac number, because 18128378839 - 2¹ = 18128378837 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 (18128378831) 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 3 ways as a sum of consecutive naturals, for example, 60027594 + ... + 60027895.

It is an arithmetic number, because the mean of its divisors is an integer number (4562108620).

Almost surely, 2^18128378839 is an apocalyptic number.

18128378839 is a deficient number, since it is larger than the sum of its proper divisors (120055641).

18128378839 is a wasteful number, since it uses less digits than its factorization.

18128378839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120055640.

The product of its digits is 4644864, while the sum is 58.

The spelling of 18128378839 in words is "eighteen billion, one hundred twenty-eight million, three hundred seventy-eight thousand, eight hundred thirty-nine".