12718889 has 4 divisors (see below), whose sum is σ = 12774660. Its totient is φ = 12663120.

The previous prime is 12718879. The next prime is 12718891. The reversal of 12718889 is 98881721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6165289 + 6553600 = 2483^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 12718889 - 2⁸ = 12718633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12718819) 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, 27542 + ... + 27999.

It is an arithmetic number, because the mean of its divisors is an integer number (3193665).

Almost surely, 2^12718889 is an apocalyptic number.

It is an amenable number.

12718889 is a deficient number, since it is larger than the sum of its proper divisors (55771).

12718889 is an equidigital number, since it uses as much as digits as its factorization.

12718889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55770.

The product of its digits is 64512, while the sum is 44.

The square root of 12718889 is about 3566.3551421584. The cubic root of 12718889 is about 233.4262675155.

The spelling of 12718889 in words is "twelve million, seven hundred eighteen thousand, eight hundred eighty-nine".