13280805 has 12 divisors (see below), whose sum is σ = 23020140. Its totient is φ = 7083072.

The previous prime is 13280797. The next prime is 13280819. The reversal of 13280805 is 50808231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4334724 + 8946081 = 2082^2 + 2991^2 .

It is not a de Polignac number, because 13280805 - 2³ = 13280797 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 147520 + ... + 147609.

It is an arithmetic number, because the mean of its divisors is an integer number (1918345).

Almost surely, 2^13280805 is an apocalyptic number.

13280805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13280805 is a deficient number, since it is larger than the sum of its proper divisors (9739335).

13280805 is a wasteful number, since it uses less digits than its factorization.

13280805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295140 (or 295137 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 13280805 is about 3644.2838802706. The cubic root of 13280805 is about 236.8144143454.

The spelling of 13280805 in words is "thirteen million, two hundred eighty thousand, eight hundred five".