223565 has 8 divisors (see below), whose sum is σ = 273048. Its totient is φ = 175680.

The previous prime is 223549. The next prime is 223577. The reversal of 223565 is 565322.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24649 + 198916 = 157^2 + 446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 223565 - 2⁴ = 223549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (34131).

2²²³⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

223565 is a deficient number, since it is larger than the sum of its proper divisors (49483).

223565 is an equidigital number, since it uses as much as digits as its factorization.

223565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799.

The product of its digits is 1800, while the sum is 23.

The square root of 223565 is about 472.8266066964. The cubic root of 223565 is about 60.6924409797.

Adding to 223565 its reverse (565322), we get a palindrome (788887).

The spelling of 223565 in words is "two hundred twenty-three thousand, five hundred sixty-five".