12865 has 8 divisors (see below), whose sum is σ = 16128. Its totient is φ = 9840.

The previous prime is 12853. The next prime is 12889. The reversal of 12865 is 56821.

It is a happy number.

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

It is not a de Polignac number, because 12865 - 2¹³ = 4673 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114 + ... + 196.

It is an arithmetic number, because the mean of its divisors is an integer number (2016).

2¹²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

12865 is a deficient number, since it is larger than the sum of its proper divisors (3263).

12865 is an equidigital number, since it uses as much as digits as its factorization.

12865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119.

The product of its digits is 480, while the sum is 22.

The square root of 12865 is about 113.4239833545. The cubic root of 12865 is about 23.4316711431.

Subtracting 12865 from its reverse (56821), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 12865 in words is "twelve thousand, eight hundred sixty-five".