1280984 has 16 divisors (see below), whose sum is σ = 2543400. Its totient is φ = 602752.

The previous prime is 1280969. The next prime is 1280987. The reversal of 1280984 is 4890821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280987) 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 3 ways as a sum of consecutive naturals, for example, 4574 + ... + 4845.

2^1280984 is an apocalyptic number.

It is an amenable number.

1280984 is a deficient number, since it is larger than the sum of its proper divisors (1262416).

1280984 is a wasteful number, since it uses less digits than its factorization.

1280984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442 (or 9438 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1280984 is about 1131.8056370243. The cubic root of 1280984 is about 108.6045203178.

The spelling of 1280984 in words is "one million, two hundred eighty thousand, nine hundred eighty-four".