442813 has 8 divisors (see below), whose sum is σ = 516800. Its totient is φ = 379260.

The previous prime is 442807. The next prime is 442817. The reversal of 442813 is 318244.

It is not a de Polignac number, because 442813 - 2⁵ = 442781 is a prime.

It is a super-3 number, since 3×442813³ = 260484773334785391, which contains 333 as substring.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 303 + ... + 988.

It is an arithmetic number, because the mean of its divisors is an integer number (64600).

2⁴⁴²⁸¹³ is an apocalyptic number.

It is an amenable number.

442813 is a deficient number, since it is larger than the sum of its proper divisors (73987).

442813 is an equidigital number, since it uses as much as digits as its factorization.

442813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1298 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 442813 is about 665.4419584006. The cubic root of 442813 is about 76.2207914643.

The spelling of 442813 in words is "four hundred forty-two thousand, eight hundred thirteen".