223812 has 18 divisors (see below), whose sum is σ = 565838. Its totient is φ = 74592.

The previous prime is 223781. The next prime is 223823. The reversal of 223812 is 218322.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 15876 = 456^2 + 126^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×223812² = 100183622688, which contains 22 as substring.

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

It is a nialpdrome in base 6 and base 12.

It is an unprimeable number.

223812 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3073 + ... + 3144.

2²²³⁸¹² is an apocalyptic number.

It is an amenable number.

223812 is an abundant number, since it is smaller than the sum of its proper divisors (342026).

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

223812 is a wasteful number, since it uses less digits than its factorization.

223812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227 (or 6222 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 223812 is about 473.0877297077. The cubic root of 223812 is about 60.7147842437.

It can be divided in two parts, 223 and 812, that added together give a triangular number (1035 = T₄₅).

The spelling of 223812 in words is "two hundred twenty-three thousand, eight hundred twelve".