12687 has 4 divisors (see below), whose sum is σ = 16920. Its totient is φ = 8456.

The previous prime is 12671. The next prime is 12689. The reversal of 12687 is 78621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12687 - 2⁴ = 12671 is a prime.

It is a D-number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689) 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, 2112 + ... + 2117.

It is an arithmetic number, because the mean of its divisors is an integer number (4230).

2¹²⁶⁸⁷ is an apocalyptic number.

12687 is a deficient number, since it is larger than the sum of its proper divisors (4233).

12687 is an equidigital number, since it uses as much as digits as its factorization.

12687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232.

The product of its digits is 672, while the sum is 24.

The square root of 12687 is about 112.6365837550. The cubic root of 12687 is about 23.3231020904.

It can be divided in two parts, 1268 and 7, that added together give a triangular number (1275 = T₅₀).

The spelling of 12687 in words is "twelve thousand, six hundred eighty-seven".