12987865 has 8 divisors (see below), whose sum is σ = 17002368. Its totient is φ = 9445680.

The previous prime is 12987841. The next prime is 12987869. The reversal of 12987865 is 56878921.

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

It is not a de Polignac number, because 12987865 - 2⁵ = 12987833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12987869) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 118017 + ... + 118126.

It is an arithmetic number, because the mean of its divisors is an integer number (2125296).

Almost surely, 2^12987865 is an apocalyptic number.

It is an amenable number.

12987865 is a deficient number, since it is larger than the sum of its proper divisors (4014503).

12987865 is a wasteful number, since it uses less digits than its factorization.

12987865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236159.

The product of its digits is 241920, while the sum is 46.

The square root of 12987865 is about 3603.8680608480. The cubic root of 12987865 is about 235.0602833122.

The spelling of 12987865 in words is "twelve million, nine hundred eighty-seven thousand, eight hundred sixty-five".