223409 has 4 divisors (see below), whose sum is σ = 228900. Its totient is φ = 217920.

The previous prime is 223403. The next prime is 223423. The reversal of 223409 is 904322.

223409 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 an emirpimes, since its reverse is a distinct semiprime: 904322 = 2 ⋅452161.

It can be written as a sum of positive squares in 2 ways, for example, as 16384 + 207025 = 128^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 223409 - 2¹² = 219313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223403) 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, 2684 + ... + 2765.

It is an arithmetic number, because the mean of its divisors is an integer number (57225).

2²²³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

223409 is a deficient number, since it is larger than the sum of its proper divisors (5491).

223409 is an equidigital number, since it uses as much as digits as its factorization.

223409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 223409 is about 472.6616125729. The cubic root of 223409 is about 60.6783209641.

The spelling of 223409 in words is "two hundred twenty-three thousand, four hundred nine".