13668891 has 8 divisors (see below), whose sum is σ = 18341904. Its totient is φ = 9054240.

The previous prime is 13668881. The next prime is 13668911. The reversal of 13668891 is 19886631.

13668891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13668891 - 2⁶ = 13668827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13668841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14040 + ... + 14981.

It is an arithmetic number, because the mean of its divisors is an integer number (2292738).

Almost surely, 2^13668891 is an apocalyptic number.

13668891 is a deficient number, since it is larger than the sum of its proper divisors (4673013).

13668891 is a wasteful number, since it uses less digits than its factorization.

13668891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29181.

The product of its digits is 62208, while the sum is 42.

The square root of 13668891 is about 3697.1463319701. The cubic root of 13668891 is about 239.0990002024.

The spelling of 13668891 in words is "thirteen million, six hundred sixty-eight thousand, eight hundred ninety-one".