13688217 has 16 divisors (see below), whose sum is σ = 20613760. Its totient is φ = 8974800.

The previous prime is 13688173. The next prime is 13688221. The reversal of 13688217 is 71288631.

It is a de Polignac number, because none of the positive numbers 2^k-13688217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13688317) 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 15 ways as a sum of consecutive naturals, for example, 2509 + ... + 5802.

It is an arithmetic number, because the mean of its divisors is an integer number (1288360).

Almost surely, 2^13688217 is an apocalyptic number.

It is an amenable number.

13688217 is a deficient number, since it is larger than the sum of its proper divisors (6925543).

13688217 is an equidigital number, since it uses as much as digits as its factorization.

13688217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381 (or 8375 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 13688217 is about 3699.7590462083. The cubic root of 13688217 is about 239.2116319012.

The spelling of 13688217 in words is "thirteen million, six hundred eighty-eight thousand, two hundred seventeen".