12786289 has 4 divisors (see below), whose sum is σ = 12899556. Its totient is φ = 12673024.

The previous prime is 12786283. The next prime is 12786311. The reversal of 12786289 is 98268721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98268721 = 17 ⋅5780513.

It can be written as a sum of positive squares in 2 ways, for example, as 1361889 + 11424400 = 1167^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 12786289 - 2³ = 12786281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12786281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56464 + ... + 56689.

It is an arithmetic number, because the mean of its divisors is an integer number (3224889).

Almost surely, 2^12786289 is an apocalyptic number.

It is an amenable number.

12786289 is a deficient number, since it is larger than the sum of its proper divisors (113267).

12786289 is a wasteful number, since it uses less digits than its factorization.

12786289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113266.

The product of its digits is 96768, while the sum is 43.

The square root of 12786289 is about 3575.7920800852. The cubic root of 12786289 is about 233.8378658683.

The spelling of 12786289 in words is "twelve million, seven hundred eighty-six thousand, two hundred eighty-nine".