13728643 has 8 divisors (see below), whose sum is σ = 14043456. Its totient is φ = 13416000.

The previous prime is 13728607. The next prime is 13728647. The reversal of 13728643 is 34682731.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13728643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13728599 and 13728608.

It is not an unprimeable number, because it can be changed into a prime (13728647) 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, 22543 + ... + 23143.

It is an arithmetic number, because the mean of its divisors is an integer number (1755432).

Almost surely, 2^13728643 is an apocalyptic number.

13728643 is a deficient number, since it is larger than the sum of its proper divisors (314813).

13728643 is an equidigital number, since it uses as much as digits as its factorization.

13728643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085.

The product of its digits is 24192, while the sum is 34.

The square root of 13728643 is about 3705.2183471423. The cubic root of 13728643 is about 239.4468917856.

The spelling of 13728643 in words is "thirteen million, seven hundred twenty-eight thousand, six hundred forty-three".