1286647 has 2 divisors, whose sum is σ = 1286648. Its totient is φ = 1286646.

The previous prime is 1286641. The next prime is 1286653. The reversal of 1286647 is 7466821.

It is a balanced prime because it is at equal distance from previous prime (1286641) and next prime (1286653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1286647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286641) 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, 643323 + 643324.

It is an arithmetic number, because the mean of its divisors is an integer number (643324).

2^1286647 is an apocalyptic number.

1286647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286647 is an equidigital number, since it uses as much as digits as its factorization.

1286647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 1286647 is about 1134.3046328037. The cubic root of 1286647 is about 108.7643254128.

The spelling of 1286647 in words is "one million, two hundred eighty-six thousand, six hundred forty-seven".