442281 has 8 divisors (see below), whose sum is σ = 673984. Its totient is φ = 252720.

The previous prime is 442271. The next prime is 442283. The reversal of 442281 is 182244.

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

It is not a de Polignac number, because 442281 - 2⁶ = 442217 is a prime.

It is a super-2 number, since 2×442281² = 391224965922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 21061 = 442281 / (4 + 4 + 2 + 2 + 8 + 1).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 442281.

It is not an unprimeable number, because it can be changed into a prime (442283) 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 7 ways as a sum of consecutive naturals, for example, 10510 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (84248).

2⁴⁴²²⁸¹ is an apocalyptic number.

It is an amenable number.

442281 is a deficient number, since it is larger than the sum of its proper divisors (231703).

442281 is a wasteful number, since it uses less digits than its factorization.

442281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21071.

The product of its digits is 512, while the sum is 21.

The square root of 442281 is about 665.0421039303. The cubic root of 442281 is about 76.1902550899.

The spelling of 442281 in words is "four hundred forty-two thousand, two hundred eighty-one".