1278688 has 24 divisors (see below), whose sum is σ = 2600640. Its totient is φ = 618240.

The previous prime is 1278671. The next prime is 1278701. The reversal of 1278688 is 8868721.

It is a self number, because there is not a number n which added to its sum of digits gives 1278688.

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, 348 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2^1278688 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 1278688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300320).

1278688 is an abundant number, since it is smaller than the sum of its proper divisors (1321952).

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

1278688 is a wasteful number, since it uses less digits than its factorization.

1278688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 1322 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The square root of 1278688 is about 1130.7908736809. The cubic root of 1278688 is about 108.5395949410.

The spelling of 1278688 in words is "one million, two hundred seventy-eight thousand, six hundred eighty-eight".