1286656 has 40 divisors (see below), whose sum is σ = 2946240. Its totient is φ = 549888.

The previous prime is 1286653. The next prime is 1286657. The reversal of 1286656 is 6566821.

Its product of digits (17280) is a multiple of the sum of its prime factors (384).

It is not an unprimeable number, because it can be changed into a prime (1286653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405 + ... + 3763.

It is an arithmetic number, because the mean of its divisors is an integer number (73656).

2^1286656 is an apocalyptic number.

1286656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1473120).

1286656 is an abundant number, since it is smaller than the sum of its proper divisors (1659584).

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

1286656 is an frugal number, since it uses more digits than its factorization.

1286656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 368 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1286656 is about 1134.3085999850. The cubic root of 1286656 is about 108.7645790117.

It can be divided in two parts, 12 and 86656, that added together give a palindrome (86668).

The spelling of 1286656 in words is "one million, two hundred eighty-six thousand, six hundred fifty-six".