12786889 has 2 divisors, whose sum is σ = 12786890. Its totient is φ = 12786888.

The previous prime is 12786871. The next prime is 12786901. The reversal of 12786889 is 98868721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 6335289 = 2540^2 + 2517^2 .

It is a cyclic number.

It is not a de Polignac number, because 12786889 - 2²¹ = 10689737 is a prime.

It is not a weakly prime, because it can be changed into another prime (12786089) 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 as a sum of consecutive naturals, namely, 6393444 + 6393445.

It is an arithmetic number, because the mean of its divisors is an integer number (6393445).

Almost surely, 2^12786889 is an apocalyptic number.

It is an amenable number.

12786889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12786889 is an equidigital number, since it uses as much as digits as its factorization.

12786889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 12786889 is about 3575.8759765965. The cubic root of 12786889 is about 233.8415234457.

The spelling of 12786889 in words is "twelve million, seven hundred eighty-six thousand, eight hundred eighty-nine".