442839 has 4 divisors (see below), whose sum is σ = 590456. Its totient is φ = 295224.

The previous prime is 442837. The next prime is 442843. The reversal of 442839 is 938244.

It is a happy number.

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

It is not a de Polignac number, because 442839 - 2¹ = 442837 is a prime.

It is a super-2 number, since 2×442839² = 392212759842, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442831) 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, 73804 + ... + 73809.

It is an arithmetic number, because the mean of its divisors is an integer number (147614).

2⁴⁴²⁸³⁹ is an apocalyptic number.

442839 is a deficient number, since it is larger than the sum of its proper divisors (147617).

442839 is a wasteful number, since it uses less digits than its factorization.

442839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147616.

The product of its digits is 6912, while the sum is 30.

The square root of 442839 is about 665.4614940025. The cubic root of 442839 is about 76.2222832165. Note that the first 4 decimals are identical.

The spelling of 442839 in words is "four hundred forty-two thousand, eight hundred thirty-nine".