1278928 has 40 divisors (see below), whose sum is σ = 2985920. Its totient is φ = 518400.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278928 is 8298721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1828 + ... + 2428.

It is an arithmetic number, because the mean of its divisors is an integer number (74648).

2^1278928 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 1278928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492960).

1278928 is an abundant number, since it is smaller than the sum of its proper divisors (1706992).

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

1278928 is a wasteful number, since it uses less digits than its factorization.

1278928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 629 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1278928 is about 1130.8969891197. The cubic root of 1278928 is about 108.5463852013.

The spelling of 1278928 in words is "one million, two hundred seventy-eight thousand, nine hundred twenty-eight".