12722389 has 4 divisors (see below), whose sum is σ = 12740256. Its totient is φ = 12704524.

The previous prime is 12722377. The next prime is 12722393. The reversal of 12722389 is 98322721.

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 not a de Polignac number, because 12722389 - 2⁵ = 12722357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12722089) 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, 7819 + ... + 9304.

It is an arithmetic number, because the mean of its divisors is an integer number (3185064).

Almost surely, 2^12722389 is an apocalyptic number.

It is an amenable number.

12722389 is a deficient number, since it is larger than the sum of its proper divisors (17867).

12722389 is an equidigital number, since it uses as much as digits as its factorization.

12722389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17866.

The product of its digits is 12096, while the sum is 34.

The square root of 12722389 is about 3566.8458054701. The cubic root of 12722389 is about 233.4476770639.

It can be divided in two parts, 12 and 722389, that multiplied together give a palindrome (8668668).

The spelling of 12722389 in words is "twelve million, seven hundred twenty-two thousand, three hundred eighty-nine".