1280559 has 24 divisors (see below), whose sum is σ = 2082688. Its totient is φ = 685440.

The previous prime is 1280549. The next prime is 1280561. The reversal of 1280559 is 9550821.

It is not a de Polignac number, because 1280559 - 2⁷ = 1280431 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280519) 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 in 23 ways as a sum of consecutive naturals, for example, 5964 + ... + 6174.

2^1280559 is an apocalyptic number.

1280559 is a deficient number, since it is larger than the sum of its proper divisors (802129).

1280559 is a wasteful number, since it uses less digits than its factorization.

1280559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1280559 is about 1131.6178683637. The cubic root of 1280559 is about 108.5925081910.

The spelling of 1280559 in words is "one million, two hundred eighty thousand, five hundred fifty-nine".