223412809 has 3 divisors (see below), whose sum is σ = 223427757. Its totient is φ = 223397862.

The previous prime is 223412801. The next prime is 223412857. The reversal of 223412809 is 908214322.

The square root of 223412809 is 14947.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 908214322 = 2 ⋅454107161.

It is not a de Polignac number, because 223412809 - 2³ = 223412801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223412801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7474 + ... + 22420.

It is an arithmetic number, because the mean of its divisors is an integer number (74475919).

Almost surely, 2^223412809 is an apocalyptic number.

223412809 is the 14947-th square number.

223412809 is the 7474-th centered octagonal number.

It is an amenable number.

223412809 is a deficient number, since it is larger than the sum of its proper divisors (14948).

223412809 is an frugal number, since it uses more digits than its factorization.

223412809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29894 (or 14947 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The cubic root of 223412809 is about 606.7866580606.

The spelling of 223412809 in words is "two hundred twenty-three million, four hundred twelve thousand, eight hundred nine".