442318 has 4 divisors (see below), whose sum is σ = 663480. Its totient is φ = 221158.

The previous prime is 442291. The next prime is 442319. The reversal of 442318 is 813244.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442319) by changing a digit.

442318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110578 + ... + 110581.

It is an arithmetic number, because the mean of its divisors is an integer number (165870).

2⁴⁴²³¹⁸ is an apocalyptic number.

442318 is a deficient number, since it is larger than the sum of its proper divisors (221162).

442318 is a wasteful number, since it uses less digits than its factorization.

442318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221161.

The product of its digits is 768, while the sum is 22.

The square root of 442318 is about 665.0699211361. The cubic root of 442318 is about 76.1923796523.

The spelling of 442318 in words is "four hundred forty-two thousand, three hundred eighteen".