1287887 has 2 divisors, whose sum is σ = 1287888. Its totient is φ = 1287886.

The previous prime is 1287883. The next prime is 1287899. The reversal of 1287887 is 7887821.

It is a weak prime.

It is an emirp because it is prime and its reverse (7887821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287887 - 2² = 1287883 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287883) 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 as a sum of consecutive naturals, namely, 643943 + 643944.

It is an arithmetic number, because the mean of its divisors is an integer number (643944).

2^1287887 is an apocalyptic number.

1287887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287887 is an equidigital number, since it uses as much as digits as its factorization.

1287887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 41.

The square root of 1287887 is about 1134.8510915534. The cubic root of 1287887 is about 108.7992545634.

The spelling of 1287887 in words is "one million, two hundred eighty-seven thousand, eight hundred eighty-seven".