2166223 has 4 divisors (see below), whose sum is σ = 2170288. Its totient is φ = 2162160.

The previous prime is 2166221. The next prime is 2166233. The reversal of 2166223 is 3226612.

It is a happy number.

2166223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166223 - 2¹ = 2166221 is a prime.

It is a Duffinian number.

2166223 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2166194 and 2166203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1086 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (542572).

2^2166223 is an apocalyptic number.

2166223 is a deficient number, since it is larger than the sum of its proper divisors (4065).

2166223 is an equidigital number, since it uses as much as digits as its factorization.

2166223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064.

The product of its digits is 864, while the sum is 22.

The square root of 2166223 is about 1471.8094305989. The cubic root of 2166223 is about 129.3901017012.

The spelling of 2166223 in words is "two million, one hundred sixty-six thousand, two hundred twenty-three".