12866881 has 4 divisors (see below), whose sum is σ = 13058992. Its totient is φ = 12674772.

The previous prime is 12866879. The next prime is 12866899. The reversal of 12866881 is 18866821.

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: 18866821 = 17 ⋅1109813.

It is a cyclic number.

It is not a de Polignac number, because 12866881 - 2¹ = 12866879 is a prime.

It is a super-2 number, since 2×12866881² = 331113253336322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12866801) 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, 95955 + ... + 96088.

It is an arithmetic number, because the mean of its divisors is an integer number (3264748).

Almost surely, 2^12866881 is an apocalyptic number.

It is an amenable number.

12866881 is a deficient number, since it is larger than the sum of its proper divisors (192111).

12866881 is an equidigital number, since it uses as much as digits as its factorization.

12866881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192110.

The product of its digits is 36864, while the sum is 40.

The square root of 12866881 is about 3587.0434901183. The cubic root of 12866881 is about 234.3281307405.

The spelling of 12866881 in words is "twelve million, eight hundred sixty-six thousand, eight hundred eighty-one".