442381 has 4 divisors (see below), whose sum is σ = 445500. Its totient is φ = 439264.

The previous prime is 442367. The next prime is 442397. The reversal of 442381 is 183244.

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 19881 + 422500 = 141^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 442381 - 2¹¹ = 440333 is a prime.

It is a super-2 number, since 2×442381² = 391401898322, which contains 22 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 (442181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1336 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (111375).

2⁴⁴²³⁸¹ is an apocalyptic number.

It is an amenable number.

442381 is a deficient number, since it is larger than the sum of its proper divisors (3119).

442381 is a wasteful number, since it uses less digits than its factorization.

442381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118.

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

The square root of 442381 is about 665.1172828908. The cubic root of 442381 is about 76.1959968780.

The spelling of 442381 in words is "four hundred forty-two thousand, three hundred eighty-one".