40442005 has 4 divisors (see below), whose sum is σ = 48530412. Its totient is φ = 32353600.

The previous prime is 40441991. The next prime is 40442009. The reversal of 40442005 is 50024404.

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 30569841 + 9872164 = 5529^2 + 3142^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40442005 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 (40442009) 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, 4044196 + ... + 4044205.

It is an arithmetic number, because the mean of its divisors is an integer number (12132603).

Almost surely, 2^40442005 is an apocalyptic number.

It is an amenable number.

40442005 is a deficient number, since it is larger than the sum of its proper divisors (8088407).

40442005 is an equidigital number, since it uses as much as digits as its factorization.

40442005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8088406.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 40442005 is about 6359.4028807743. The cubic root of 40442005 is about 343.2502742074.

Adding to 40442005 its reverse (50024404), we get a palindrome (90466409).

The spelling of 40442005 in words is "forty million, four hundred forty-two thousand, five".