442018 has 8 divisors (see below), whose sum is σ = 685980. Its totient is φ = 213360.

The previous prime is 442009. The next prime is 442019. The reversal of 442018 is 810244.

It can be written as a sum of positive squares in 2 ways, for example, as 418609 + 23409 = 647^2 + 153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 441986 and 442004.

It is not an unprimeable number, because it can be changed into a prime (442019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3753 + ... + 3868.

2⁴⁴²⁰¹⁸ is an apocalyptic number.

442018 is a deficient number, since it is larger than the sum of its proper divisors (243962).

442018 is a wasteful number, since it uses less digits than its factorization.

442018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7652.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 442018 is about 664.8443426848. The cubic root of 442018 is about 76.1751500547.

The spelling of 442018 in words is "four hundred forty-two thousand, eighteen".