1280784 has 20 divisors (see below), whose sum is σ = 3308816. Its totient is φ = 426912.

The previous prime is 1280767. The next prime is 1280789. The reversal of 1280784 is 4870821.

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

It is not an unprimeable number, because it can be changed into a prime (1280789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13294 + ... + 13389.

2^1280784 is an apocalyptic number.

It is an amenable number.

1280784 is an abundant number, since it is smaller than the sum of its proper divisors (2028032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1280784 is a wasteful number, since it uses less digits than its factorization.

1280784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26694 (or 26688 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 1280784 is about 1131.7172791824. The cubic root of 1280784 is about 108.5988678833.

The spelling of 1280784 in words is "one million, two hundred eighty thousand, seven hundred eighty-four".