223506 has 16 divisors (see below), whose sum is σ = 496800. Its totient is φ = 74484.

The previous prime is 223493. The next prime is 223507. The reversal of 223506 is 605322.

Added to its reverse (605322) it gives a triangular number (828828 = T₁₂₈₇).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 8.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (223507) 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, 2016 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (31050).

2²²³⁵⁰⁶ is an apocalyptic number.

223506 is an abundant number, since it is smaller than the sum of its proper divisors (273294).

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

223506 is a wasteful number, since it uses less digits than its factorization.

223506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150 (or 4144 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 223506 is about 472.7642118435. The cubic root of 223506 is about 60.6871014899.

Adding to 223506 its reverse (605322), we get a palindrome (828828).

It can be divided in two parts, 223 and 506, that added together give a 6-th power (729 = 3⁶).

The spelling of 223506 in words is "two hundred twenty-three thousand, five hundred six".