12687947 has 2 divisors, whose sum is σ = 12687948. Its totient is φ = 12687946.

The previous prime is 12687943. The next prime is 12687971. The reversal of 12687947 is 74978621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12687947 - 2² = 12687943 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12687898 and 12687907.

It is not a weakly prime, because it can be changed into another prime (12687943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6343973 + 6343974.

It is an arithmetic number, because the mean of its divisors is an integer number (6343974).

Almost surely, 2^12687947 is an apocalyptic number.

12687947 is a deficient number, since it is larger than the sum of its proper divisors (1).

12687947 is an equidigital number, since it uses as much as digits as its factorization.

12687947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 12687947 is about 3562.0144581402. The cubic root of 12687947 is about 233.2368238068.

The spelling of 12687947 in words is "twelve million, six hundred eighty-seven thousand, nine hundred forty-seven".