442643 has 4 divisors (see below), whose sum is σ = 465960. Its totient is φ = 419328.

The previous prime is 442633. The next prime is 442691. The reversal of 442643 is 346244.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 442643 - 2⁶ = 442579 is a prime.

It is a d-powerful number, because it can be written as 4³ + 4⁵ + 6³ + 2¹¹ + 4⁹ + 3¹¹ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11630 + ... + 11667.

It is an arithmetic number, because the mean of its divisors is an integer number (116490).

2⁴⁴²⁶⁴³ is an apocalyptic number.

442643 is a deficient number, since it is larger than the sum of its proper divisors (23317).

442643 is a wasteful number, since it uses less digits than its factorization.

442643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23316.

The product of its digits is 2304, while the sum is 23.

The square root of 442643 is about 665.3142114821. The cubic root of 442643 is about 76.2110362606.

Adding to 442643 its reverse (346244), we get a palindrome (788887).

The spelling of 442643 in words is "four hundred forty-two thousand, six hundred forty-three".