12687866 has 16 divisors (see below), whose sum is σ = 19830528. Its totient is φ = 6081600.

The previous prime is 12687863. The next prime is 12687869. The reversal of 12687866 is 66878621.

It is an interprime number because it is at equal distance from previous prime (12687863) and next prime (12687869).

It is a super-3 number, since 3×12687866³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12687863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6101 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (1239408).

Almost surely, 2^12687866 is an apocalyptic number.

12687866 is a deficient number, since it is larger than the sum of its proper divisors (7142662).

12687866 is a wasteful number, since it uses less digits than its factorization.

12687866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957.

The product of its digits is 193536, while the sum is 44.

The square root of 12687866 is about 3562.0030881514. The cubic root of 12687866 is about 233.2363274769.

The spelling of 12687866 in words is "twelve million, six hundred eighty-seven thousand, eight hundred sixty-six".