13881909 has 4 divisors (see below), whose sum is σ = 18509216. Its totient is φ = 9254604.

The previous prime is 13881871. The next prime is 13881943. The reversal of 13881909 is 90918831.

It is a happy number.

13881909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13881909 - 2⁷ = 13881781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881209) 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 3 ways as a sum of consecutive naturals, for example, 2313649 + ... + 2313654.

It is an arithmetic number, because the mean of its divisors is an integer number (4627304).

Almost surely, 2^13881909 is an apocalyptic number.

It is an amenable number.

13881909 is a deficient number, since it is larger than the sum of its proper divisors (4627307).

13881909 is an equidigital number, since it uses as much as digits as its factorization.

13881909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4627306.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 13881909 is about 3725.8433944545. The cubic root of 13881909 is about 240.3346546703.

The spelling of 13881909 in words is "thirteen million, eight hundred eighty-one thousand, nine hundred nine".