13521864 has 16 divisors (see below), whose sum is σ = 33804720. Its totient is φ = 4507280.

The previous prime is 13521829. The next prime is 13521881. The reversal of 13521864 is 46812531.

13521864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281682 + ... + 281729.

It is an arithmetic number, because the mean of its divisors is an integer number (2112795).

Almost surely, 2^13521864 is an apocalyptic number.

It is an amenable number.

13521864 is an abundant number, since it is smaller than the sum of its proper divisors (20282856).

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

13521864 is a wasteful number, since it uses less digits than its factorization.

13521864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563420 (or 563416 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 13521864 is about 3677.2087240188. The cubic root of 13521864 is about 238.2386326724.

It can be divided in two parts, 1352186 and 4, that added together give a triangular number (1352190 = T₁₆₄₄).

The spelling of 13521864 in words is "thirteen million, five hundred twenty-one thousand, eight hundred sixty-four".