It is a plaindrome in base 9.
It is a self number, because there is not a number n which added to its sum of digits gives 15856.
It is a congruent number.
215856 is an apocalyptic number.
15856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.
It is an amenable number.
15856 is an equidigital number, since it uses as much as digits as its factorization.
15856 is an odious number, because the sum of its binary digits is odd.
The square root of 15856 is about 125.9206099096. The cubic root of 15856 is about 25.1225978083.
The spelling of 15856 in words is "fifteen thousand, eight hundred fifty-six".