12787 has 4 divisors (see below), whose sum is σ = 13480. Its totient is φ = 12096.

The previous prime is 12781. The next prime is 12791. The reversal of 12787 is 78721.

It is a happy number.

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 12787 - 2⁷ = 12659 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (12781) 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, 318 + ... + 355.

It is an arithmetic number, because the mean of its divisors is an integer number (3370).

2¹²⁷⁸⁷ is an apocalyptic number.

12787 is a deficient number, since it is larger than the sum of its proper divisors (693).

12787 is an equidigital number, since it uses as much as digits as its factorization.

12787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 784, while the sum is 25.

The square root of 12787 is about 113.0796179689. The cubic root of 12787 is about 23.3842200085.

The spelling of 12787 in words is "twelve thousand, seven hundred eighty-seven".