223644 has 12 divisors (see below), whose sum is σ = 521864. Its totient is φ = 74544.

The previous prime is 223637. The next prime is 223667. The reversal of 223644 is 446322.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 16.

It is a nialpdrome in base 6 and base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 223644.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 223644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9307 + ... + 9330.

2²²³⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

223644 is an abundant number, since it is smaller than the sum of its proper divisors (298220).

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

223644 is a wasteful number, since it uses less digits than its factorization.

223644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18644 (or 18642 counting only the distinct ones).

The product of its digits is 1152, while the sum is 21.

The square root of 223644 is about 472.9101394557. The cubic root of 223644 is about 60.6995889951.

Adding to 223644 its reverse (446322), we get a palindrome (669966).

The spelling of 223644 in words is "two hundred twenty-three thousand, six hundred forty-four".