12663865 has 8 divisors (see below), whose sum is σ = 15720840. Its totient is φ = 9781632.

The previous prime is 12663829. The next prime is 12663877. The reversal of 12663865 is 56836621.

It can be written as a sum of positive squares in 4 ways, for example, as 364816 + 12299049 = 604^2 + 3507^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12663865 - 2¹⁹ = 12139577 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 43524 + ... + 43813.

It is an arithmetic number, because the mean of its divisors is an integer number (1965105).

Almost surely, 2^12663865 is an apocalyptic number.

It is an amenable number.

12663865 is a deficient number, since it is larger than the sum of its proper divisors (3056975).

12663865 is an equidigital number, since it uses as much as digits as its factorization.

12663865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87371.

The product of its digits is 51840, while the sum is 37.

The square root of 12663865 is about 3558.6324620562. The cubic root of 12663865 is about 233.0891674904.

The spelling of 12663865 in words is "twelve million, six hundred sixty-three thousand, eight hundred sixty-five".