1286669 has 2 divisors, whose sum is σ = 1286670. Its totient is φ = 1286668.

The previous prime is 1286657. The next prime is 1286683. The reversal of 1286669 is 9666821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 131044 = 1075^2 + 362^2 .

It is an emirp because it is prime and its reverse (9666821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1286669 - 2⁴ = 1286653 is a prime.

It is a super-2 number, since 2×1286669² = 3311034231122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643334 + 643335.

It is an arithmetic number, because the mean of its divisors is an integer number (643335).

2^1286669 is an apocalyptic number.

It is an amenable number.

1286669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286669 is an equidigital number, since it uses as much as digits as its factorization.

1286669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 1286669 is about 1134.3143303335. The cubic root of 1286669 is about 108.7649453191.

The spelling of 1286669 in words is "one million, two hundred eighty-six thousand, six hundred sixty-nine".