1285256 has 32 divisors (see below), whose sum is σ = 2808000. Its totient is φ = 540096.

The previous prime is 1285247. The next prime is 1285259. The reversal of 1285256 is 6525821.

It is not an unprimeable number, because it can be changed into a prime (1285259) 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, 3110 + ... + 3498.

It is an arithmetic number, because the mean of its divisors is an integer number (87750).

2^1285256 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 1285256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404000).

1285256 is an abundant number, since it is smaller than the sum of its proper divisors (1522744).

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

1285256 is a wasteful number, since it uses less digits than its factorization.

1285256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 457 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 1285256 is about 1133.6913160115. The cubic root of 1285256 is about 108.7251160752.

The spelling of 1285256 in words is "one million, two hundred eighty-five thousand, two hundred fifty-six".