223665 has 32 divisors (see below), whose sum is σ = 408576. Its totient is φ = 103680.

The previous prime is 223637. The next prime is 223667. The reversal of 223665 is 566322.

It is not a de Polignac number, because 223665 - 2⁵ = 223633 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 223665.

It is not an unprimeable number, because it can be changed into a prime (223667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6027 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (12768).

2²²³⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

223665 is a deficient number, since it is larger than the sum of its proper divisors (184911).

223665 is a wasteful number, since it uses less digits than its factorization.

223665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89.

The product of its digits is 2160, while the sum is 24.

The square root of 223665 is about 472.9323418841. The cubic root of 223665 is about 60.7014888172.

Adding to 223665 its reverse (566322), we get a palindrome (789987).

It can be divided in two parts, 223 and 665, that added together give a palindrome (888).

The spelling of 223665 in words is "two hundred twenty-three thousand, six hundred sixty-five".