11785 has 4 divisors (see below), whose sum is σ = 14148. Its totient is φ = 9424.

The previous prime is 11783. The next prime is 11789. The reversal of 11785 is 58711.

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 3136 + 8649 = 56^2 + 93^2 .

It is a cyclic number.

It is not a de Polignac number, because 11785 - 2¹ = 11783 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11783) 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, 1174 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (3537).

2¹¹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

11785 is a deficient number, since it is larger than the sum of its proper divisors (2363).

11785 is an equidigital number, since it uses as much as digits as its factorization.

11785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362.

The product of its digits is 280, while the sum is 22.

The square root of 11785 is about 108.5587398600. The cubic root of 11785 is about 22.7567302874.

It can be divided in two parts, 117 and 85, that added together give a palindrome (202).

The spelling of 11785 in words is "eleven thousand, seven hundred eighty-five".