40440005 has 4 divisors (see below), whose sum is σ = 48528012. Its totient is φ = 32352000.

The previous prime is 40439977. The next prime is 40440013. The reversal of 40440005 is 50004404.

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 24940036 + 15499969 = 4994^2 + 3937^2 .

It is not a de Polignac number, because 40440005 - 2¹⁶ = 40374469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4043996 + ... + 4044005.

It is an arithmetic number, because the mean of its divisors is an integer number (12132003).

Almost surely, 2^40440005 is an apocalyptic number.

It is an amenable number.

40440005 is a deficient number, since it is larger than the sum of its proper divisors (8088007).

40440005 is an equidigital number, since it uses as much as digits as its factorization.

40440005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8088006.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 40440005 is about 6359.2456313623. The cubic root of 40440005 is about 343.2446158012.

Adding to 40440005 its reverse (50004404), we get a palindrome (90444409).

The spelling of 40440005 in words is "forty million, four hundred forty thousand, five".