42218 has 16 divisors (see below), whose sum is σ = 73440. Its totient is φ = 18000.

The previous prime is 42209. The next prime is 42221. The reversal of 42218 is 81224.

42218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 42196 and 42205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368 + ... + 468.

It is an arithmetic number, because the mean of its divisors is an integer number (4590).

2⁴²²¹⁸ is an apocalyptic number.

42218 is a deficient number, since it is larger than the sum of its proper divisors (31222).

42218 is a wasteful number, since it uses less digits than its factorization.

42218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133.

The product of its digits is 128, while the sum is 17.

The square root of 42218 is about 205.4701924854. The cubic root of 42218 is about 34.8203034732.

It can be divided in two parts, 4 and 2218, that added together give a palindrome (2222).

The spelling of 42218 in words is "forty-two thousand, two hundred eighteen".