19387128859 has 12 divisors (see below), whose sum is σ = 22636227600. Its totient is φ = 16555752528.

The previous prime is 19387128853. The next prime is 19387128889. The reversal of 19387128859 is 95882178391.

It is not a de Polignac number, because 19387128859 - 2³¹ = 17239645211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19387128797 and 19387128806.

It is not an unprimeable number, because it can be changed into a prime (19387128853) 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 11 ways as a sum of consecutive naturals, for example, 722239 + ... + 748600.

It is an arithmetic number, because the mean of its divisors is an integer number (1886352300).

Almost surely, 2^19387128859 is an apocalyptic number.

19387128859 is a deficient number, since it is larger than the sum of its proper divisors (3249098741).

19387128859 is a wasteful number, since it uses less digits than its factorization.

19387128859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471122 (or 1471115 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 61.

The spelling of 19387128859 in words is "nineteen billion, three hundred eighty-seven million, one hundred twenty-eight thousand, eight hundred fifty-nine".