12809987 has 2 divisors, whose sum is σ = 12809988. Its totient is φ = 12809986.

The previous prime is 12809983. The next prime is 12810013. The reversal of 12809987 is 78990821.

12809987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12809987 - 2² = 12809983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12809983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6404993 + 6404994.

It is an arithmetic number, because the mean of its divisors is an integer number (6404994).

Almost surely, 2^12809987 is an apocalyptic number.

12809987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12809987 is an equidigital number, since it uses as much as digits as its factorization.

12809987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 12809987 is about 3579.1042175382. The cubic root of 12809987 is about 233.9822410854.

The spelling of 12809987 in words is "twelve million, eight hundred nine thousand, nine hundred eighty-seven".