442905 has 8 divisors (see below), whose sum is σ = 708672. Its totient is φ = 236208.

The previous prime is 442903. The next prime is 442919. The reversal of 442905 is 509244.

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

It is not a de Polignac number, because 442905 - 2¹ = 442903 is a prime.

It is a Curzon number.

442905 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (442903) 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, 14749 + ... + 14778.

It is an arithmetic number, because the mean of its divisors is an integer number (88584).

2⁴⁴²⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

442905 is a deficient number, since it is larger than the sum of its proper divisors (265767).

442905 is a wasteful number, since it uses less digits than its factorization.

442905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29535.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 442905 is about 665.5110818010. The cubic root of 442905 is about 76.2260697099.

The spelling of 442905 in words is "four hundred forty-two thousand, nine hundred five".