2218505 has 4 divisors (see below), whose sum is σ = 2662212. Its totient is φ = 1774800.

The previous prime is 2218451. The next prime is 2218519. The reversal of 2218505 is 5058122.

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 1317904 + 900601 = 1148^2 + 949^2 .

It is not a de Polignac number, because 2218505 - 2¹⁴ = 2202121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221846 + ... + 221855.

It is an arithmetic number, because the mean of its divisors is an integer number (665553).

2^2218505 is an apocalyptic number.

It is an amenable number.

2218505 is a deficient number, since it is larger than the sum of its proper divisors (443707).

2218505 is an equidigital number, since it uses as much as digits as its factorization.

2218505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443706.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2218505 is about 1489.4646689331. The cubic root of 2218505 is about 130.4227852653.

The spelling of 2218505 in words is "two million, two hundred eighteen thousand, five hundred five".