13726721 has 4 divisors (see below), whose sum is σ = 14449200. Its totient is φ = 13004244.

The previous prime is 13726717. The next prime is 13726723. The reversal of 13726721 is 12762731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13726721 - 2² = 13726717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13726723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361211 + ... + 361248.

It is an arithmetic number, because the mean of its divisors is an integer number (3612300).

Almost surely, 2^13726721 is an apocalyptic number.

It is an amenable number.

13726721 is a deficient number, since it is larger than the sum of its proper divisors (722479).

13726721 is an equidigital number, since it uses as much as digits as its factorization.

13726721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722478.

The product of its digits is 3528, while the sum is 29.

The square root of 13726721 is about 3704.9589741318. The cubic root of 13726721 is about 239.4357171341.

The spelling of 13726721 in words is "thirteen million, seven hundred twenty-six thousand, seven hundred twenty-one".