1280928 has 48 divisors (see below), whose sum is σ = 3671136. Its totient is φ = 387840.

The previous prime is 1280921. The next prime is 1280947. The reversal of 1280928 is 8290821.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1280895 and 1280904.

It is not an unprimeable number, because it can be changed into a prime (1280921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450 + ... + 1662.

It is an arithmetic number, because the mean of its divisors is an integer number (76482).

2^1280928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1835568).

1280928 is an abundant number, since it is smaller than the sum of its proper divisors (2390208).

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

1280928 is a wasteful number, since it uses less digits than its factorization.

1280928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1229 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1280928 is about 1131.7808975239. The cubic root of 1280928 is about 108.6029376955.

The spelling of 1280928 in words is "one million, two hundred eighty thousand, nine hundred twenty-eight".