218418 has 16 divisors (see below), whose sum is σ = 444960. Its totient is φ = 71456.

The previous prime is 218417. The next prime is 218419. The reversal of 218418 is 814812.

218418 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (218417) and next prime (218419).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (218417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 662.

It is an arithmetic number, because the mean of its divisors is an integer number (27810).

2²¹⁸⁴¹⁸ is an apocalyptic number.

218418 is an abundant number, since it is smaller than the sum of its proper divisors (226542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218418 is a wasteful number, since it uses less digits than its factorization.

218418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681.

The product of its digits is 512, while the sum is 24.

The square root of 218418 is about 467.3521156473. The cubic root of 218418 is about 60.2230586089.

It can be divided in two parts, 218 and 418, that added together give a palindrome (636).

The spelling of 218418 in words is "two hundred eighteen thousand, four hundred eighteen".