2218645 has 32 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 1424640.

The previous prime is 2218621. The next prime is 2218663. The reversal of 2218645 is 5468122.

2218645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2218645 - 2⁵ = 2218613 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 20682 + ... + 20788.

It is an arithmetic number, because the mean of its divisors is an integer number (102060).

2^2218645 is an apocalyptic number.

It is an amenable number.

2218645 is a deficient number, since it is larger than the sum of its proper divisors (1047275).

2218645 is a wasteful number, since it uses less digits than its factorization.

2218645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165.

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

The square root of 2218645 is about 1489.5116649426. The cubic root of 2218645 is about 130.4255286752.

The spelling of 2218645 in words is "two million, two hundred eighteen thousand, six hundred forty-five".