218845 has 16 divisors (see below), whose sum is σ = 300672. Its totient is φ = 151360.

The previous prime is 218843. The next prime is 218849. The reversal of 218845 is 548812.

It is not a de Polignac number, because 218845 - 2¹ = 218843 is a prime.

It is a Duffinian number.

218845 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1179 + ... + 1351.

It is an arithmetic number, because the mean of its divisors is an integer number (18792).

2²¹⁸⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

218845 is a deficient number, since it is larger than the sum of its proper divisors (81827).

218845 is a wasteful number, since it uses less digits than its factorization.

218845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its digits is 2560, while the sum is 28.

The square root of 218845 is about 467.8087215946. The cubic root of 218845 is about 60.2622777616.

It can be divided in two parts, 21 and 8845, that multiplied together give a triangular number (185745 = T₆₀₉).

The spelling of 218845 in words is "two hundred eighteen thousand, eight hundred forty-five".