13440005 has 16 divisors (see below), whose sum is σ = 16846704. Its totient is φ = 10283520.

The previous prime is 13440001. The next prime is 13440041. The reversal of 13440005 is 50004431.

It can be written as a sum of positive squares in 8 ways, for example, as 146689 + 13293316 = 383^2 + 3646^2 .

It is not a de Polignac number, because 13440005 - 2² = 13440001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10247 + ... + 11483.

It is an arithmetic number, because the mean of its divisors is an integer number (1052919).

Almost surely, 2^13440005 is an apocalyptic number.

It is an amenable number.

13440005 is a deficient number, since it is larger than the sum of its proper divisors (3406699).

13440005 is a wasteful number, since it uses less digits than its factorization.

13440005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 13440005 is about 3666.0612378955. The cubic root of 13440005 is about 237.7569075943.

Adding to 13440005 its reverse (50004431), we get a palindrome (63444436).

The spelling of 13440005 in words is "thirteen million, four hundred forty thousand, five".