223805 has 8 divisors (see below), whose sum is σ = 284472. Its totient is φ = 168448.

The previous prime is 223781. The next prime is 223823. The reversal of 223805 is 508322.

It can be written as a sum of positive squares in 4 ways, for example, as 17689 + 206116 = 133^2 + 454^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 223805 - 2⁸ = 223549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (35559).

2²²³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

223805 is a deficient number, since it is larger than the sum of its proper divisors (60667).

223805 is a wasteful number, since it uses less digits than its factorization.

223805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 223805 is about 473.0803314449. The cubic root of 223805 is about 60.7141512602.

The spelling of 223805 in words is "two hundred twenty-three thousand, eight hundred five".