13881771 has 12 divisors (see below), whose sum is σ = 20593872. Its totient is φ = 9004176.

The previous prime is 13881757. The next prime is 13881773. The reversal of 13881771 is 17718831.

It is a de Polignac number, because none of the positive numbers 2^k-13881771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13881773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20511 + ... + 21176.

It is an arithmetic number, because the mean of its divisors is an integer number (1716156).

Almost surely, 2^13881771 is an apocalyptic number.

13881771 is a deficient number, since it is larger than the sum of its proper divisors (6712101).

13881771 is a wasteful number, since it uses less digits than its factorization.

13881771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41730 (or 41727 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 13881771 is about 3725.8248751116. The cubic root of 13881771 is about 240.3338582790. Note that the first 3 decimals are identical.

It can be divided in two parts, 13881 and 771, that multiplied together give a triangular number (10702251 = T₄₆₂₆).

The spelling of 13881771 in words is "thirteen million, eight hundred eighty-one thousand, seven hundred seventy-one".