1280869 has 2 divisors, whose sum is σ = 1280870. Its totient is φ = 1280868.

The previous prime is 1280863. The next prime is 1280887. The reversal of 1280869 is 9680821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 3969 = 1130^2 + 63^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280869 - 2⁵ = 1280837 is a prime.

It is a super-2 number, since 2×1280869² = 3281250790322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280863) 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, 640434 + 640435.

It is an arithmetic number, because the mean of its divisors is an integer number (640435).

2^1280869 is an apocalyptic number.

It is an amenable number.

1280869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280869 is an equidigital number, since it uses as much as digits as its factorization.

1280869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1280869 is about 1131.7548321081. The cubic root of 1280869 is about 108.6012702399.

The spelling of 1280869 in words is "one million, two hundred eighty thousand, eight hundred sixty-nine".