23645 has 4 divisors (see below), whose sum is σ = 28380. Its totient is φ = 18912.

The previous prime is 23633. The next prime is 23663. The reversal of 23645 is 54632.

23645 is digitally balanced in base 6, 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 3481 + 20164 = 59^2 + 142^2 .

It is a cyclic number.

It is not a de Polignac number, because 23645 - 2⁴ = 23629 is a prime.

23645 is strictly pandigital in base 6.

It is a plaindrome in base 14.

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, 2360 + ... + 2369.

It is an arithmetic number, because the mean of its divisors is an integer number (7095).

2²³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

23645 is a deficient number, since it is larger than the sum of its proper divisors (4735).

23645 is an equidigital number, since it uses as much as digits as its factorization.

23645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734.

The product of its digits is 720, while the sum is 20.

The square root of 23645 is about 153.7693077308. The cubic root of 23645 is about 28.7020625210.

The spelling of 23645 in words is "twenty-three thousand, six hundred forty-five".