2218705 has 16 divisors (see below), whose sum is σ = 2790720. Its totient is φ = 1691712.

The previous prime is 2218691. The next prime is 2218709. The reversal of 2218705 is 5078122.

2218705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2218705 - 2¹¹ = 2216657 is a prime.

2218705 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2218705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218709) 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 15 ways as a sum of consecutive naturals, for example, 12306 + ... + 12484.

It is an arithmetic number, because the mean of its divisors is an integer number (174420).

2^2218705 is an apocalyptic number.

It is an amenable number.

2218705 is a deficient number, since it is larger than the sum of its proper divisors (572015).

2218705 is a wasteful number, since it uses less digits than its factorization.

2218705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2218705 is about 1489.5318056356. The cubic root of 2218705 is about 130.4267043870.

The spelling of 2218705 in words is "two million, two hundred eighteen thousand, seven hundred five".