222784 has 21 divisors (see below), whose sum is σ = 449707. Its totient is φ = 109504.

The previous prime is 222779. The next prime is 222787. The reversal of 222784 is 487222.

222784 = T₄₇₁ + T₄₇₂.

The square root of 222784 is 472.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (222787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3747 + ... + 3805.

222784 is a Friedman number, since it can be written as 472^(8/(2+2)), using all its digits and the basic arithmetic operations.

2²²²⁷⁸⁴ is an apocalyptic number.

222784 is the 472-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222784

222784 is an abundant number, since it is smaller than the sum of its proper divisors (226923).

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

222784 is an frugal number, since it uses more digits than its factorization.

222784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 61 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The cubic root of 222784 is about 60.6216843760.

Multiplying 222784 by its sum of digits (25), we get a square (5569600 = 2360²).

The spelling of 222784 in words is "two hundred twenty-two thousand, seven hundred eighty-four".