12689841 has 4 divisors (see below), whose sum is σ = 16919792. Its totient is φ = 8459892.

The previous prime is 12689821. The next prime is 12689857. The reversal of 12689841 is 14898621.

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 de Polignac number, because none of the positive numbers 2^k-12689841 is a prime.

It is a super-2 number, since 2×12689841² = 322064129210562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12689841.

It is not an unprimeable number, because it can be changed into a prime (12689821) 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, 2114971 + ... + 2114976.

It is an arithmetic number, because the mean of its divisors is an integer number (4229948).

Almost surely, 2^12689841 is an apocalyptic number.

It is an amenable number.

12689841 is a deficient number, since it is larger than the sum of its proper divisors (4229951).

12689841 is an equidigital number, since it uses as much as digits as its factorization.

12689841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4229950.

The product of its digits is 27648, while the sum is 39.

The square root of 12689841 is about 3562.2803090156. The cubic root of 12689841 is about 233.2484287461.

It can be divided in two parts, 12689 and 841, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 12689841 in words is "twelve million, six hundred eighty-nine thousand, eight hundred forty-one".