13881756 has 48 divisors (see below), whose sum is σ = 37658880. Its totient is φ = 3897600.

The previous prime is 13881737. The next prime is 13881757. The reversal of 13881756 is 65718831.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3556 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (784560).

Almost surely, 2^13881756 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 13881756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18829440).

13881756 is an abundant number, since it is smaller than the sum of its proper divisors (23777124).

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

13881756 is a wasteful number, since it uses less digits than its factorization.

13881756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874 (or 2872 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 13881756 is about 3725.8228621339. The cubic root of 13881756 is about 240.3337717144. Note that the first 3 decimals are identical.

The spelling of 13881756 in words is "thirteen million, eight hundred eighty-one thousand, seven hundred fifty-six".