12865665 has 8 divisors (see below), whose sum is σ = 20585088. Its totient is φ = 6861680.

The previous prime is 12865663. The next prime is 12865667. The reversal of 12865665 is 56656821.

12865665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12865663) and next prime (12865667).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12865665 - 2¹ = 12865663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12865663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428841 + ... + 428870.

It is an arithmetic number, because the mean of its divisors is an integer number (2573136).

Almost surely, 2^12865665 is an apocalyptic number.

12865665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12865665 is a deficient number, since it is larger than the sum of its proper divisors (7719423).

12865665 is an equidigital number, since it uses as much as digits as its factorization.

12865665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857719.

The product of its digits is 86400, while the sum is 39.

The square root of 12865665 is about 3586.8739871927. The cubic root of 12865665 is about 234.3207486877.

It can be divided in two parts, 12865 and 665, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 12865665 in words is "twelve million, eight hundred sixty-five thousand, six hundred sixty-five".