12887917 has 16 divisors (see below), whose sum is σ = 15409152. Its totient is φ = 10548720.

The previous prime is 12887893. The next prime is 12887923. The reversal of 12887917 is 71978821.

It is a happy number.

It is not a de Polignac number, because 12887917 - 2¹⁹ = 12363629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

Its product of digits (56448) is a multiple of the sum of its prime divisors (1008).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12887117) 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 15 ways as a sum of consecutive naturals, for example, 13692 + ... + 14602.

It is an arithmetic number, because the mean of its divisors is an integer number (963072).

Almost surely, 2^12887917 is an apocalyptic number.

It is an amenable number.

12887917 is a deficient number, since it is larger than the sum of its proper divisors (2521235).

12887917 is an equidigital number, since it uses as much as digits as its factorization.

12887917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008.

The product of its digits is 56448, while the sum is 43.

The square root of 12887917 is about 3589.9745124443. The cubic root of 12887917 is about 234.4557618446.

The spelling of 12887917 in words is "twelve million, eight hundred eighty-seven thousand, nine hundred seventeen".