13287805 has 4 divisors (see below), whose sum is σ = 15945372. Its totient is φ = 10630240.

The previous prime is 13287797. The next prime is 13287811. The reversal of 13287805 is 50878231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50878231 = 23 ⋅2212097.

It can be written as a sum of positive squares in 2 ways, for example, as 6260004 + 7027801 = 2502^2 + 2651^2 .

It is not a de Polignac number, because 13287805 - 2³ = 13287797 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1328776 + ... + 1328785.

It is an arithmetic number, because the mean of its divisors is an integer number (3986343).

Almost surely, 2^13287805 is an apocalyptic number.

It is an amenable number.

13287805 is a deficient number, since it is larger than the sum of its proper divisors (2657567).

13287805 is an equidigital number, since it uses as much as digits as its factorization.

13287805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657566.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 13287805 is about 3645.2441619184. The cubic root of 13287805 is about 236.8560134739.

The spelling of 13287805 in words is "thirteen million, two hundred eighty-seven thousand, eight hundred five".