223456789 has 8 divisors (see below), whose sum is σ = 236922840. Its totient is φ = 210026496.

The previous prime is 223456781. The next prime is 223456811. The reversal of 223456789 is 987654322.

223456789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 53363025 + 170093764 = 7305^2 + 13042^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 223456789 - 2³ = 223456781 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223456781) 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, 4527 + ... + 21619.

It is an arithmetic number, because the mean of its divisors is an integer number (29615355).

Almost surely, 2^223456789 is an apocalyptic number.

It is an amenable number.

223456789 is a deficient number, since it is larger than the sum of its proper divisors (13466051).

223456789 is a wasteful number, since it uses less digits than its factorization.

223456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17879.

The product of its digits is 725760, while the sum is 46.

The square root of 223456789 is about 14948.4711258376. The cubic root of 223456789 is about 606.8264718421.

It can be divided in two parts, 22345678 and 9, that multiplied together give a palindrome (201111102).

The spelling of 223456789 in words is "two hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine".