442749 has 4 divisors (see below), whose sum is σ = 590336. Its totient is φ = 295164.

The previous prime is 442747. The next prime is 442753. The reversal of 442749 is 947244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 442749 - 2¹ = 442747 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442747) 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, 73789 + ... + 73794.

It is an arithmetic number, because the mean of its divisors is an integer number (147584).

2⁴⁴²⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

442749 is a deficient number, since it is larger than the sum of its proper divisors (147587).

442749 is a wasteful number, since it uses less digits than its factorization.

442749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147586.

The product of its digits is 8064, while the sum is 30.

The square root of 442749 is about 665.3938683216. The cubic root of 442749 is about 76.2171192102.

The spelling of 442749 in words is "four hundred forty-two thousand, seven hundred forty-nine".