12987515 has 4 divisors (see below), whose sum is σ = 15585024. Its totient is φ = 10390008.

The previous prime is 12987509. The next prime is 12987523. The reversal of 12987515 is 51578921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12987515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1298747 + ... + 1298756.

It is an arithmetic number, because the mean of its divisors is an integer number (3896256).

Almost surely, 2^12987515 is an apocalyptic number.

12987515 is a deficient number, since it is larger than the sum of its proper divisors (2597509).

12987515 is an equidigital number, since it uses as much as digits as its factorization.

12987515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597508.

The product of its digits is 25200, while the sum is 38.

The square root of 12987515 is about 3603.8195015844. The cubic root of 12987515 is about 235.0581718069.

The spelling of 12987515 in words is "twelve million, nine hundred eighty-seven thousand, five hundred fifteen".