1280009679 has 16 divisors (see below), whose sum is σ = 1946079072. Its totient is φ = 741362688.

The previous prime is 1280009629. The next prime is 1280009699. The reversal of 1280009679 is 9769000821.

It is not a de Polignac number, because 1280009679 - 2⁹ = 1280009167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1280009679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280009629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 964654 + ... + 965979.

It is an arithmetic number, because the mean of its divisors is an integer number (121629942).

Almost surely, 2^1280009679 is an apocalyptic number.

1280009679 is a deficient number, since it is larger than the sum of its proper divisors (666069393).

1280009679 is a wasteful number, since it uses less digits than its factorization.

1280009679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930666.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1280009679 is about 35777.2229078781. Note that the first 3 decimals coincide. The cubic root of 1280009679 is about 1085.7697833861.

The spelling of 1280009679 in words is "one billion, two hundred eighty million, nine thousand, six hundred seventy-nine".