13728717 has 8 divisors (see below), whose sum is σ = 20338880. Its totient is φ = 9152460.

The previous prime is 13728713. The next prime is 13728731. The reversal of 13728717 is 71782731.

It is a happy number.

It is not a de Polignac number, because 13728717 - 2² = 13728713 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 (13728713) 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, 254209 + ... + 254262.

It is an arithmetic number, because the mean of its divisors is an integer number (2542360).

Almost surely, 2^13728717 is an apocalyptic number.

It is an amenable number.

13728717 is a deficient number, since it is larger than the sum of its proper divisors (6610163).

13728717 is an equidigital number, since it uses as much as digits as its factorization.

13728717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508480 (or 508474 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 13728717 is about 3705.2283330451. The cubic root of 13728717 is about 239.4473220063.

The spelling of 13728717 in words is "thirteen million, seven hundred twenty-eight thousand, seven hundred seventeen".