442591 has 4 divisors (see below), whose sum is σ = 446992. Its totient is φ = 438192.

The previous prime is 442579. The next prime is 442601. The reversal of 442591 is 195244.

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

It is a cyclic number.

It is not a de Polignac number, because 442591 - 2¹¹ = 440543 is a prime.

It is a Duffinian 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046 + ... + 2251.

It is an arithmetic number, because the mean of its divisors is an integer number (111748).

2⁴⁴²⁵⁹¹ is an apocalyptic number.

442591 is a deficient number, since it is larger than the sum of its proper divisors (4401).

442591 is a wasteful number, since it uses less digits than its factorization.

442591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400.

The product of its digits is 1440, while the sum is 25.

The square root of 442591 is about 665.2751310548. The cubic root of 442591 is about 76.2080518171.

The spelling of 442591 in words is "four hundred forty-two thousand, five hundred ninety-one".