223309 has 4 divisors (see below), whose sum is σ = 225504. Its totient is φ = 221116.

The previous prime is 223303. The next prime is 223313. The reversal of 223309 is 903322.

223309 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 223309 - 2⁵ = 223277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223303) 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, 937 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (56376).

2²²³³⁰⁹ is an apocalyptic number.

It is an amenable number.

223309 is a deficient number, since it is larger than the sum of its proper divisors (2195).

223309 is a wasteful number, since it uses less digits than its factorization.

223309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 223309 is about 472.5558168090. Note that the first 3 decimals coincide. The cubic root of 223309 is about 60.6692662145.

The spelling of 223309 in words is "two hundred twenty-three thousand, three hundred nine".