442218 has 16 divisors (see below), whose sum is σ = 1010880. Its totient is φ = 126336.

The previous prime is 442217. The next prime is 442229. The reversal of 442218 is 812244.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 442194 and 442203.

It is not an unprimeable number, because it can be changed into a prime (442217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5223 + ... + 5306.

It is an arithmetic number, because the mean of its divisors is an integer number (63180).

2⁴⁴²²¹⁸ is an apocalyptic number.

442218 is an abundant number, since it is smaller than the sum of its proper divisors (568662).

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

442218 is a wasteful number, since it uses less digits than its factorization.

442218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541.

The product of its digits is 512, while the sum is 21.

The square root of 442218 is about 664.9947368213. The cubic root of 442218 is about 76.1866373190.

The spelling of 442218 in words is "four hundred forty-two thousand, two hundred eighteen".