12865865 has 8 divisors (see below), whose sum is σ = 15490248. Its totient is φ = 10258560.

The previous prime is 12865859. The next prime is 12865871. The reversal of 12865865 is 56856821.

It is an interprime number because it is at equal distance from previous prime (12865859) and next prime (12865871).

It can be written as a sum of positive squares in 4 ways, for example, as 727609 + 12138256 = 853^2 + 3484^2 .

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

It is not a de Polignac number, because 12865865 - 2¹² = 12861769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2546 + ... + 5675.

It is an arithmetic number, because the mean of its divisors is an integer number (1936281).

Almost surely, 2^12865865 is an apocalyptic number.

It is an amenable number.

12865865 is a deficient number, since it is larger than the sum of its proper divisors (2624383).

12865865 is an equidigital number, since it uses as much as digits as its factorization.

12865865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8539.

The product of its digits is 115200, while the sum is 41.

The square root of 12865865 is about 3586.9018665138. The cubic root of 12865865 is about 234.3219628731.

The spelling of 12865865 in words is "twelve million, eight hundred sixty-five thousand, eight hundred sixty-five".