1281256 has 16 divisors (see below), whose sum is σ = 2543940. Its totient is φ = 602880.

The previous prime is 1281253. The next prime is 1281257. The reversal of 1281256 is 6521821.

It can be written as a sum of positive squares in 2 ways, for example, as 1276900 + 4356 = 1130^2 + 66^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1281256.

It is not an unprimeable number, because it can be changed into a prime (1281253) 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, 4575 + ... + 4846.

2^1281256 is an apocalyptic number.

It is an amenable number.

1281256 is a deficient number, since it is larger than the sum of its proper divisors (1262684).

1281256 is a wasteful number, since it uses less digits than its factorization.

1281256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9444 (or 9440 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 1281256 is about 1131.9257926207. The cubic root of 1281256 is about 108.6122066847.

The spelling of 1281256 in words is "one million, two hundred eighty-one thousand, two hundred fifty-six".