1285856 has 48 divisors (see below), whose sum is σ = 2984688. Its totient is φ = 537600.

The previous prime is 1285853. The next prime is 1285859. The reversal of 1285856 is 6585821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1285853) and next prime (1285859).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4436 + ... + 4716.

It is an arithmetic number, because the mean of its divisors is an integer number (62181).

2^1285856 is an apocalyptic number.

1285856 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 1285856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492344).

1285856 is an abundant number, since it is smaller than the sum of its proper divisors (1698832).

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

1285856 is a wasteful number, since it uses less digits than its factorization.

1285856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 307 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The square root of 1285856 is about 1133.9559074320. The cubic root of 1285856 is about 108.7420322696.

Subtracting from 1285856 its sum of digits (35), we obtain a palindrome (1285821).

The spelling of 1285856 in words is "one million, two hundred eighty-five thousand, eight hundred fifty-six".