223809 has 8 divisors (see below), whose sum is σ = 303552. Its totient is φ = 146640.

The previous prime is 223781. The next prime is 223823. The reversal of 223809 is 908322.

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

It is not a de Polignac number, because 223809 - 2⁷ = 223681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (223829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429 + ... + 794.

It is an arithmetic number, because the mean of its divisors is an integer number (37944).

2²²³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

223809 is a deficient number, since it is larger than the sum of its proper divisors (79743).

223809 is a wasteful number, since it uses less digits than its factorization.

223809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 223809 is about 473.0845590378. The cubic root of 223809 is about 60.7145129667.

The spelling of 223809 in words is "two hundred twenty-three thousand, eight hundred nine".