13881636 has 36 divisors (see below), whose sum is σ = 35590464. Its totient is φ = 4561200.

The previous prime is 13881617. The next prime is 13881641. The reversal of 13881636 is 63618831.

13881636 is a `hidden beast` number, since 13 + 8 + 8 + 1 + 636 = 666.

13881636 is nontrivially palindromic in base 13.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 13881636.

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 11 ways as a sum of consecutive naturals, for example, 160 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (988624).

Almost surely, 2^13881636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13881636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17795232).

13881636 is an abundant number, since it is smaller than the sum of its proper divisors (21708828).

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

13881636 is a wasteful number, since it uses less digits than its factorization.

13881636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512 (or 5507 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13881636 is about 3725.8067582740. The cubic root of 13881636 is about 240.3330791955. Note that the first 3 decimals are identical.

The spelling of 13881636 in words is "thirteen million, eight hundred eighty-one thousand, six hundred thirty-six".