13040805 has 16 divisors (see below), whose sum is σ = 20916864. Its totient is φ = 6937920.

The previous prime is 13040789. The next prime is 13040827. The reversal of 13040805 is 50804031.

It is not a de Polignac number, because 13040805 - 2⁴ = 13040789 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7312 + ... + 8918.

It is an arithmetic number, because the mean of its divisors is an integer number (1307304).

Almost surely, 2^13040805 is an apocalyptic number.

13040805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13040805 is a deficient number, since it is larger than the sum of its proper divisors (7876059).

13040805 is a wasteful number, since it uses less digits than its factorization.

13040805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 13040805 is about 3611.2054773995. The cubic root of 13040805 is about 235.3792277460.

Adding to 13040805 its reverse (50804031), we get a palindrome (63844836).

The spelling of 13040805 in words is "thirteen million, forty thousand, eight hundred five".