12688839 has 8 divisors (see below), whose sum is σ = 18798320. Its totient is φ = 8459208.

The previous prime is 12688829. The next prime is 12688859. The reversal of 12688839 is 93888621.

It is a de Polignac number, because none of the positive numbers 2^k-12688839 is a prime.

It is a super-2 number, since 2×12688839² = 322013270335842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12688794 and 12688803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688829) 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 7 ways as a sum of consecutive naturals, for example, 234952 + ... + 235005.

It is an arithmetic number, because the mean of its divisors is an integer number (2349790).

Almost surely, 2^12688839 is an apocalyptic number.

12688839 is a deficient number, since it is larger than the sum of its proper divisors (6109481).

12688839 is an equidigital number, since it uses as much as digits as its factorization.

12688839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469966 (or 469960 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 12688839 is about 3562.1396659873. The cubic root of 12688839 is about 233.2422894237.

The spelling of 12688839 in words is "twelve million, six hundred eighty-eight thousand, eight hundred thirty-nine".