12687865 has 8 divisors (see below), whose sum is σ = 16121160. Its totient is φ = 9553152.

The previous prime is 12687863. The next prime is 12687869. The reversal of 12687865 is 56878621.

It can be written as a sum of positive squares in 4 ways, for example, as 2972176 + 9715689 = 1724^2 + 3117^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12687865 - 2¹ = 12687863 is a prime.

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, 74550 + ... + 74719.

It is an arithmetic number, because the mean of its divisors is an integer number (2015145).

Almost surely, 2^12687865 is an apocalyptic number.

It is an amenable number.

12687865 is a deficient number, since it is larger than the sum of its proper divisors (3433295).

12687865 is a wasteful number, since it uses less digits than its factorization.

12687865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149291.

The product of its digits is 161280, while the sum is 43.

The square root of 12687865 is about 3562.0029477809. The cubic root of 12687865 is about 233.2363213493.

The spelling of 12687865 in words is "twelve million, six hundred eighty-seven thousand, eight hundred sixty-five".