442581 has 8 divisors (see below), whose sum is σ = 594624. Its totient is φ = 292800.

The previous prime is 442579. The next prime is 442601. The reversal of 442581 is 185244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 442581 - 2¹ = 442579 is a prime.

It is a super-2 number, since 2×442581² = 391755883122, which contains 22 as substring.

It is a Curzon number.

442581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (74328).

2⁴⁴²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

442581 is a deficient number, since it is larger than the sum of its proper divisors (152043).

442581 is a wasteful number, since it uses less digits than its factorization.

442581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131.

The product of its digits is 1280, while the sum is 24.

The square root of 442581 is about 665.2676153248. The cubic root of 442581 is about 76.2074778589.

The spelling of 442581 in words is "four hundred forty-two thousand, five hundred eighty-one".