12857856 has 80 divisors (see below), whose sum is σ = 37417248. Its totient is φ = 3891200.

The previous prime is 12857843. The next prime is 12857857. The reversal of 12857856 is 65875821.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12857857) 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, 16516 + ... + 17276.

Almost surely, 2^12857856 is an apocalyptic number.

12857856 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 12857856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18708624).

12857856 is an abundant number, since it is smaller than the sum of its proper divisors (24559392).

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

12857856 is an equidigital number, since it uses as much as digits as its factorization.

12857856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 777 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 12857856 is about 3585.7852696446. The cubic root of 12857856 is about 234.2733309791.

The spelling of 12857856 in words is "twelve million, eight hundred fifty-seven thousand, eight hundred fifty-six".