12365 has 4 divisors (see below), whose sum is σ = 14844. Its totient is φ = 9888.

The previous prime is 12347. The next prime is 12373. The reversal of 12365 is 56321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56321 = 17 ⋅3313.

It can be written as a sum of positive squares in 2 ways, for example, as 6889 + 5476 = 83^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 12365 - 2⁶ = 12301 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1232 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (3711).

2¹²³⁶⁵ is an apocalyptic number.

It is an amenable number.

12365 is a deficient number, since it is larger than the sum of its proper divisors (2479).

12365 is an equidigital number, since it uses as much as digits as its factorization.

12365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478.

The product of its digits is 180, while the sum is 17.

The square root of 12365 is about 111.1980215651. The cubic root of 12365 is about 23.1240929764.

Adding to 12365 its reverse (56321), we get a palindrome (68686).

Subtracting 12365 from its reverse (56321), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 12365 in words is "twelve thousand, three hundred sixty-five".