12799987 has 2 divisors, whose sum is σ = 12799988. Its totient is φ = 12799986.

The previous prime is 12799981. The next prime is 12800009. The reversal of 12799987 is 78999721.

It is a weak prime.

It is an emirp because it is prime and its reverse (78999721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12799987 - 2¹⁵ = 12767219 is a prime.

It is not a weakly prime, because it can be changed into another prime (12799981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6399993 + 6399994.

It is an arithmetic number, because the mean of its divisors is an integer number (6399994).

Almost surely, 2^12799987 is an apocalyptic number.

12799987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12799987 is an equidigital number, since it uses as much as digits as its factorization.

12799987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 52.

The square root of 12799987 is about 3577.7069471940. The cubic root of 12799987 is about 233.9213398649.

The spelling of 12799987 in words is "twelve million, seven hundred ninety-nine thousand, nine hundred eighty-seven".