13216647 has 8 divisors (see below), whose sum is σ = 18549760. Its totient is φ = 8347320.

The previous prime is 13216639. The next prime is 13216661. The reversal of 13216647 is 74661231.

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

It is not a de Polignac number, because 13216647 - 2³ = 13216639 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 (13216607) 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 7 ways as a sum of consecutive naturals, for example, 115879 + ... + 115992.

It is an arithmetic number, because the mean of its divisors is an integer number (2318720).

Almost surely, 2^13216647 is an apocalyptic number.

13216647 is a deficient number, since it is larger than the sum of its proper divisors (5333113).

13216647 is a wasteful number, since it uses less digits than its factorization.

13216647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231893.

The product of its digits is 6048, while the sum is 30.

The square root of 13216647 is about 3635.4706710411. The cubic root of 13216647 is about 236.4324578015.

Adding to 13216647 its reverse (74661231), we get a palindrome (87877878).

The spelling of 13216647 in words is "thirteen million, two hundred sixteen thousand, six hundred forty-seven".