13686891 has 8 divisors (see below), whose sum is σ = 18274704. Its totient is φ = 9111840.

The previous prime is 13686889. The next prime is 13686901. The reversal of 13686891 is 19868631.

13686891 is digitally balanced in base 2 and base 4, because in such bases 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 13686891 - 2¹ = 13686889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13686851) 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, 316 + ... + 5241.

It is an arithmetic number, because the mean of its divisors is an integer number (2284338).

Almost surely, 2^13686891 is an apocalyptic number.

13686891 is a deficient number, since it is larger than the sum of its proper divisors (4587813).

13686891 is an equidigital number, since it uses as much as digits as its factorization.

13686891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6381.

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

The square root of 13686891 is about 3699.5798410090. The cubic root of 13686891 is about 239.2039073776.

The spelling of 13686891 in words is "thirteen million, six hundred eighty-six thousand, eight hundred ninety-one".