13720217 has 8 divisors (see below), whose sum is σ = 15703296. Its totient is φ = 11742912.

The previous prime is 13720211. The next prime is 13720247. The reversal of 13720217 is 71202731.

13720217 is digitally balanced in base 2, 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 a cyclic number.

It is not a de Polignac number, because 13720217 - 2⁸ = 13719961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13720192 and 13720201.

It is not an unprimeable number, because it can be changed into a prime (13720211) 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, 6833 + ... + 8609.

It is an arithmetic number, because the mean of its divisors is an integer number (1962912).

Almost surely, 2^13720217 is an apocalyptic number.

It is an amenable number.

13720217 is a deficient number, since it is larger than the sum of its proper divisors (1983079).

13720217 is a wasteful number, since it uses less digits than its factorization.

13720217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 13720217 is about 3704.0811276213. The cubic root of 13720217 is about 239.3978946532.

Adding to 13720217 its reverse (71202731), we get a palindrome (84922948).

The spelling of 13720217 in words is "thirteen million, seven hundred twenty thousand, two hundred seventeen".