12865505 has 4 divisors (see below), whose sum is σ = 15438612. Its totient is φ = 10292400.

The previous prime is 12865499. The next prime is 12865519. The reversal of 12865505 is 50556821.

12865505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4145296 + 8720209 = 2036^2 + 2953^2 .

It is not a de Polignac number, because 12865505 - 2¹⁴ = 12849121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1286546 + ... + 1286555.

It is an arithmetic number, because the mean of its divisors is an integer number (3859653).

Almost surely, 2^12865505 is an apocalyptic number.

It is an amenable number.

12865505 is a deficient number, since it is larger than the sum of its proper divisors (2573107).

12865505 is an equidigital number, since it uses as much as digits as its factorization.

12865505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573106.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 12865505 is about 3586.8516835799. The cubic root of 12865505 is about 234.3197773304.

The spelling of 12865505 in words is "twelve million, eight hundred sixty-five thousand, five hundred five".