13040665 has 16 divisors (see below), whose sum is σ = 17490816. Its totient is φ = 9251200.

The previous prime is 13040659. The next prime is 13040689. The reversal of 13040665 is 56604031.

It is not a de Polignac number, because 13040665 - 2¹⁷ = 12909593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637 + ... + 5146.

It is an arithmetic number, because the mean of its divisors is an integer number (1093176).

Almost surely, 2^13040665 is an apocalyptic number.

It is an amenable number.

13040665 is a deficient number, since it is larger than the sum of its proper divisors (4450151).

13040665 is a wasteful number, since it uses less digits than its factorization.

13040665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 13040665 is about 3611.1860932386. The cubic root of 13040665 is about 235.3783854358.

Adding to 13040665 its reverse (56604031), we get a palindrome (69644696).

The spelling of 13040665 in words is "thirteen million, forty thousand, six hundred sixty-five".