1286856 has 48 divisors (see below), whose sum is σ = 3554460. Its totient is φ = 420480.

The previous prime is 1286843. The next prime is 1286881. The reversal of 1286856 is 6586821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 900 = 1134^2 + 30^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1286856.

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, 4246 + ... + 4538.

2^1286856 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 1286856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1777230).

1286856 is an abundant number, since it is smaller than the sum of its proper divisors (2267604).

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

1286856 is a wasteful number, since it uses less digits than its factorization.

1286856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 359 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1286856 is about 1134.3967559897. The cubic root of 1286856 is about 108.7702142368.

It can be divided in two parts, 12 and 86856, that added together give a palindrome (86868).

The spelling of 1286856 in words is "one million, two hundred eighty-six thousand, eight hundred fifty-six".