12726289 has 4 divisors (see below), whose sum is σ = 12826624. Its totient is φ = 12625956.

The previous prime is 12726283. The next prime is 12726299. The reversal of 12726289 is 98262721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98262721 = 103 ⋅954007.

It is a cyclic number.

It is not a de Polignac number, because 12726289 - 2¹⁷ = 12595217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12726283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49977 + ... + 50230.

It is an arithmetic number, because the mean of its divisors is an integer number (3206656).

Almost surely, 2^12726289 is an apocalyptic number.

It is an amenable number.

12726289 is a deficient number, since it is larger than the sum of its proper divisors (100335).

12726289 is a wasteful number, since it uses less digits than its factorization.

12726289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100334.

The product of its digits is 24192, while the sum is 37.

The square root of 12726289 is about 3567.3924650927. The cubic root of 12726289 is about 233.4715287929.

The spelling of 12726289 in words is "twelve million, seven hundred twenty-six thousand, two hundred eighty-nine".