12688841 has 4 divisors (see below), whose sum is σ = 13842384. Its totient is φ = 11535300.

The previous prime is 12688829. The next prime is 12688859. The reversal of 12688841 is 14888621.

12688841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12688841 is a prime.

It is a super-2 number, since 2×12688841² = 322013371846562, 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 = 12688795 and 12688804.

It is not an unprimeable number, because it can be changed into a prime (12688811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576755 + ... + 576776.

It is an arithmetic number, because the mean of its divisors is an integer number (3460596).

Almost surely, 2^12688841 is an apocalyptic number.

12688841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12688841 is a deficient number, since it is larger than the sum of its proper divisors (1153543).

12688841 is a wasteful number, since it uses less digits than its factorization.

12688841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153542.

The product of its digits is 24576, while the sum is 38.

The square root of 12688841 is about 3562.1399467174. The cubic root of 12688841 is about 233.2423016781.

The spelling of 12688841 in words is "twelve million, six hundred eighty-eight thousand, eight hundred forty-one".