223440444 has 144 divisors (see below), whose sum is σ = 615433728. Its totient is φ = 70823808.

The previous prime is 223440443. The next prime is 223440457. The reversal of 223440444 is 444044322.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223440443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3060792 + ... + 3060864.

Almost surely, 2^223440444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223440444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307716864).

223440444 is an abundant number, since it is smaller than the sum of its proper divisors (391993284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

223440444 is a wasteful number, since it uses less digits than its factorization.

223440444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

The square root of 223440444 is about 14947.9244044115. The cubic root of 223440444 is about 606.8116758114.

Adding to 223440444 its reverse (444044322), we get a palindrome (667484766).

The spelling of 223440444 in words is "two hundred twenty-three million, four hundred forty thousand, four hundred forty-four".