223443309 has 4 divisors (see below), whose sum is σ = 297924416. Its totient is φ = 148962204.

The previous prime is 223443293. The next prime is 223443361. The reversal of 223443309 is 903344322.

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 not a de Polignac number, because 223443309 - 2⁴ = 223443293 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 (223443379) 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, 37240549 + ... + 37240554.

It is an arithmetic number, because the mean of its divisors is an integer number (74481104).

Almost surely, 2^223443309 is an apocalyptic number.

It is an amenable number.

223443309 is a deficient number, since it is larger than the sum of its proper divisors (74481107).

223443309 is an equidigital number, since it uses as much as digits as its factorization.

223443309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74481106.

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 223443309 is about 14948.0202368073. The cubic root of 223443309 is about 606.8142693556.

The spelling of 223443309 in words is "two hundred twenty-three million, four hundred forty-three thousand, three hundred nine".