12398987871 has 16 divisors (see below), whose sum is σ = 19335654400. Its totient is φ = 7830939384.

The previous prime is 12398987807. The next prime is 12398987879. The reversal of 12398987871 is 17878989321.

12398987871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12398987871 - 2⁶ = 12398987807 is a prime.

It is a super-3 number, since 3×12398987871³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12398987799 and 12398987808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12398987879) 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, 12084271 + ... + 12085296.

It is an arithmetic number, because the mean of its divisors is an integer number (1208478400).

Almost surely, 2^12398987871 is an apocalyptic number.

12398987871 is a deficient number, since it is larger than the sum of its proper divisors (6936666529).

12398987871 is a wasteful number, since it uses less digits than its factorization.

12398987871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24169595 (or 24169589 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 12398987871 in words is "twelve billion, three hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred seventy-one".