1280656 has 40 divisors (see below), whose sum is σ = 2749824. Its totient is φ = 574080.

The previous prime is 1280651. The next prime is 1280659. The reversal of 1280656 is 6560821.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1280651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9711 + ... + 9841.

2^1280656 is an apocalyptic number.

1280656 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 1280656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374912).

1280656 is an abundant number, since it is smaller than the sum of its proper divisors (1469168).

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

1280656 is a wasteful number, since it uses less digits than its factorization.

1280656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1280656 is about 1131.6607265431. The cubic root of 1280656 is about 108.5952500164.

It can be divided in two parts, 1280 and 656, that added together give a square (1936 = 44²).

The spelling of 1280656 in words is "one million, two hundred eighty thousand, six hundred fifty-six".