1278864 has 60 divisors (see below), whose sum is σ = 3656016. Its totient is φ = 417216.

The previous prime is 1278857. The next prime is 1278881. The reversal of 1278864 is 4688721.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11899 + ... + 12005.

2^1278864 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 1278864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828008).

1278864 is an abundant number, since it is smaller than the sum of its proper divisors (2377152).

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

1278864 is a wasteful number, since it uses less digits than its factorization.

1278864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 195 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1278864 is about 1130.8686926430. The cubic root of 1278864 is about 108.5445745483.

The spelling of 1278864 in words is "one million, two hundred seventy-eight thousand, eight hundred sixty-four".