12905687 has 2 divisors, whose sum is σ = 12905688. Its totient is φ = 12905686.

The previous prime is 12905681. The next prime is 12905689. The reversal of 12905687 is 78650921.

It is a strong prime.

It is an emirp because it is prime and its reverse (78650921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12905687 - 2²² = 8711383 is a prime.

Together with 12905689, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12905687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12905681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6452843 + 6452844.

It is an arithmetic number, because the mean of its divisors is an integer number (6452844).

Almost surely, 2^12905687 is an apocalyptic number.

12905687 is a deficient number, since it is larger than the sum of its proper divisors (1).

12905687 is an equidigital number, since it uses as much as digits as its factorization.

12905687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12905687 is about 3592.4486078440. The cubic root of 12905687 is about 234.5634690745.

The spelling of 12905687 in words is "twelve million, nine hundred five thousand, six hundred eighty-seven".