12866869 has 2 divisors, whose sum is σ = 12866870. Its totient is φ = 12866868.

The previous prime is 12866851. The next prime is 12866873. The reversal of 12866869 is 96866821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 1238769 = 3410^2 + 1113^2 .

It is a cyclic number.

It is not a de Polignac number, because 12866869 - 2⁷ = 12866741 is a prime.

It is a super-2 number, since 2×12866869² = 331112635726322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12866879) 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, 6433434 + 6433435.

It is an arithmetic number, because the mean of its divisors is an integer number (6433435).

Almost surely, 2^12866869 is an apocalyptic number.

It is an amenable number.

12866869 is a deficient number, since it is larger than the sum of its proper divisors (1).

12866869 is an equidigital number, since it uses as much as digits as its factorization.

12866869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 12866869 is about 3587.0418174312. The cubic root of 12866869 is about 234.3280578936.

The spelling of 12866869 in words is "twelve million, eight hundred sixty-six thousand, eight hundred sixty-nine".