13688947 has 4 divisors (see below), whose sum is σ = 13712400. Its totient is φ = 13665496.

The previous prime is 13688929. The next prime is 13688951. The reversal of 13688947 is 74988631.

It is a happy number.

13688947 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.

It is a cyclic number.

It is not a de Polignac number, because 13688947 - 2⁷ = 13688819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13688897 and 13688906.

It is not an unprimeable number, because it can be changed into a prime (13688047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10828 + ... + 12025.

It is an arithmetic number, because the mean of its divisors is an integer number (3428100).

Almost surely, 2^13688947 is an apocalyptic number.

13688947 is a deficient number, since it is larger than the sum of its proper divisors (23453).

13688947 is an equidigital number, since it uses as much as digits as its factorization.

13688947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23452.

The product of its digits is 290304, while the sum is 46.

The square root of 13688947 is about 3699.8576999663. The cubic root of 13688947 is about 239.2158842541.

The spelling of 13688947 in words is "thirteen million, six hundred eighty-eight thousand, nine hundred forty-seven".