440005 has 4 divisors (see below), whose sum is σ = 528012. Its totient is φ = 352000.

The previous prime is 439991. The next prime is 440009. The reversal of 440005 is 500044.

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 58081 + 381924 = 241^2 + 618^2 .

It is not a de Polignac number, because 440005 - 2⁵ = 439973 is a prime.

It is a Duffinian number.

440005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440009) 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, 43996 + ... + 44005.

It is an arithmetic number, because the mean of its divisors is an integer number (132003).

2⁴⁴⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

440005 is a deficient number, since it is larger than the sum of its proper divisors (88007).

440005 is an equidigital number, since it uses as much as digits as its factorization.

440005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88006.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 440005 is about 663.3287269522. The cubic root of 440005 is about 76.0593373166.

Adding to 440005 its reverse (500044), we get a palindrome (940049).

The spelling of 440005 in words is "four hundred forty thousand, five".