1286387 has 2 divisors, whose sum is σ = 1286388. Its totient is φ = 1286386.

The previous prime is 1286381. The next prime is 1286399. The reversal of 1286387 is 7836821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1286387 - 2⁴ = 1286371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1286381) 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, 643193 + 643194.

It is an arithmetic number, because the mean of its divisors is an integer number (643194).

2^1286387 is an apocalyptic number.

1286387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286387 is an equidigital number, since it uses as much as digits as its factorization.

1286387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 1286387 is about 1134.1900193530. The cubic root of 1286387 is about 108.7569987128.

The spelling of 1286387 in words is "one million, two hundred eighty-six thousand, three hundred eighty-seven".