442213 has 4 divisors (see below), whose sum is σ = 446380. Its totient is φ = 438048.

The previous prime is 442207. The next prime is 442217. The reversal of 442213 is 312244.

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

It can be written as a sum of positive squares in 2 ways, for example, as 268324 + 173889 = 518^2 + 417^2 .

It is a cyclic number.

It is not a de Polignac number, because 442213 - 2⁵ = 442181 is a prime.

It is a Duffinian number.

442213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (111595).

2⁴⁴²²¹³ is an apocalyptic number.

It is an amenable number.

442213 is a deficient number, since it is larger than the sum of its proper divisors (4167).

442213 is a wasteful number, since it uses less digits than its factorization.

442213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166.

The product of its digits is 192, while the sum is 16.

The square root of 442213 is about 664.9909773824. The cubic root of 442213 is about 76.1863501796.

Adding to 442213 its reverse (312244), we get a palindrome (754457).

The spelling of 442213 in words is "four hundred forty-two thousand, two hundred thirteen".