12745 has 4 divisors (see below), whose sum is σ = 15300. Its totient is φ = 10192.

The previous prime is 12743. The next prime is 12757. The reversal of 12745 is 54721.

12745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8649 + 4096 = 93^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 12745 - 2¹ = 12743 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (12743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (3825).

2¹²⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

12745 is a deficient number, since it is larger than the sum of its proper divisors (2555).

12745 is an equidigital number, since it uses as much as digits as its factorization.

12745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554.

The product of its digits is 280, while the sum is 19.

The square root of 12745 is about 112.8937553632. The cubic root of 12745 is about 23.3585894329.

It can be divided in two parts, 12 and 745, that added together give a palindrome (757).

The spelling of 12745 in words is "twelve thousand, seven hundred forty-five".