13521856 has 28 divisors (see below), whose sum is σ = 27294840. Its totient is φ = 6644480.

The previous prime is 13521829. The next prime is 13521881. The reversal of 13521856 is 65812531.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1986 + ... + 5566.

Almost surely, 2^13521856 is an apocalyptic number.

13521856 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 13521856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13647420).

13521856 is an abundant number, since it is smaller than the sum of its proper divisors (13772984).

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

13521856 is an equidigital number, since it uses as much as digits as its factorization.

13521856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652 (or 3642 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 13521856 is about 3677.2076362370. The cubic root of 13521856 is about 238.2385856890.

The spelling of 13521856 in words is "thirteen million, five hundred twenty-one thousand, eight hundred fifty-six".