223816 has 16 divisors (see below), whose sum is σ = 425340. Its totient is φ = 110400.

The previous prime is 223781. The next prime is 223823. The reversal of 223816 is 618322.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 2916 = 470^2 + 54^2 .

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 2 + 8 + 3¹¹ + 1 + 6⁶ .

It is a nialpdrome in base 8.

It is an unprimeable number.

223816 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 3 ways as a sum of consecutive naturals, for example, 670 + ... + 946.

2²²³⁸¹⁶ is an apocalyptic number.

It is an amenable number.

223816 is a deficient number, since it is larger than the sum of its proper divisors (201524).

223816 is a wasteful number, since it uses less digits than its factorization.

223816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 380 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 223816 is about 473.0919572345. The cubic root of 223816 is about 60.7151459427.

The spelling of 223816 in words is "two hundred twenty-three thousand, eight hundred sixteen".