442811 has 4 divisors (see below), whose sum is σ = 444792. Its totient is φ = 440832.

The previous prime is 442807. The next prime is 442817. The reversal of 442811 is 118244.

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 442811 - 2² = 442807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442817) 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, 605 + ... + 1118.

It is an arithmetic number, because the mean of its divisors is an integer number (111198).

2⁴⁴²⁸¹¹ is an apocalyptic number.

442811 is a deficient number, since it is larger than the sum of its proper divisors (1981).

442811 is a wasteful number, since it uses less digits than its factorization.

442811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its digits is 256, while the sum is 20.

The square root of 442811 is about 665.4404556382. The cubic root of 442811 is about 76.2206767118.

The spelling of 442811 in words is "four hundred forty-two thousand, eight hundred eleven".