2216845 has 4 divisors (see below), whose sum is σ = 2660220. Its totient is φ = 1773472.

The previous prime is 2216839. The next prime is 2216857. The reversal of 2216845 is 5486122.

2216845 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 can be written as a sum of positive squares in 2 ways, for example, as 933156 + 1283689 = 966^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216845 - 2¹³ = 2208653 is a prime.

2216845 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 221680 + ... + 221689.

It is an arithmetic number, because the mean of its divisors is an integer number (665055).

2^2216845 is an apocalyptic number.

It is an amenable number.

2216845 is a deficient number, since it is larger than the sum of its proper divisors (443375).

2216845 is an equidigital number, since it uses as much as digits as its factorization.

2216845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443374.

The product of its digits is 3840, while the sum is 28.

The square root of 2216845 is about 1488.9073174647. The cubic root of 2216845 is about 130.3902474609.

The spelling of 2216845 in words is "two million, two hundred sixteen thousand, eight hundred forty-five".