1280724 has 12 divisors (see below), whose sum is σ = 2988384. Its totient is φ = 426904.

The previous prime is 1280707. The next prime is 1280737. The reversal of 1280724 is 4270821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1280694 and 1280703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53352 + ... + 53375.

It is an arithmetic number, because the mean of its divisors is an integer number (249032).

2^1280724 is an apocalyptic number.

It is an amenable number.

1280724 is an abundant number, since it is smaller than the sum of its proper divisors (1707660).

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

1280724 is a wasteful number, since it uses less digits than its factorization.

1280724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106734 (or 106732 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1280724 is about 1131.6907704846. The cubic root of 1280724 is about 108.5971720382.

The spelling of 1280724 in words is "one million, two hundred eighty thousand, seven hundred twenty-four".