442209 has 8 divisors (see below), whose sum is σ = 593152. Its totient is φ = 293040.

The previous prime is 442207. The next prime is 442217. The reversal of 442209 is 902244.

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

It is not a de Polignac number, because 442209 - 2¹ = 442207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442201) 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, 339 + ... + 999.

It is an arithmetic number, because the mean of its divisors is an integer number (74144).

2⁴⁴²²⁰⁹ is an apocalyptic number.

It is an amenable number.

442209 is a deficient number, since it is larger than the sum of its proper divisors (150943).

442209 is a wasteful number, since it uses less digits than its factorization.

442209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 442209 is about 664.9879698160. The cubic root of 442209 is about 76.1861204665.

The spelling of 442209 in words is "four hundred forty-two thousand, two hundred nine".