13723321 has 4 divisors (see below), whose sum is σ = 14042512. Its totient is φ = 13404132.

The previous prime is 13723309. The next prime is 13723357. The reversal of 13723321 is 12332731.

It is a happy number.

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 not a de Polignac number, because 13723321 - 2⁵ = 13723289 is a prime.

It is the 3705-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13723292 and 13723301.

It is not an unprimeable number, because it can be changed into a prime (13723361) by changing a digit.

It is a nontrivial repunit in base 3704.

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 3 ways as a sum of consecutive naturals, for example, 159531 + ... + 159616.

It is an arithmetic number, because the mean of its divisors is an integer number (3510628).

Almost surely, 2^13723321 is an apocalyptic number.

It is an amenable number.

13723321 is a deficient number, since it is larger than the sum of its proper divisors (319191).

13723321 is an equidigital number, since it uses as much as digits as its factorization.

13723321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319190.

The product of its digits is 756, while the sum is 22.

The square root of 13723321 is about 3704.5001012282. The cubic root of 13723321 is about 239.4159467252.

The spelling of 13723321 in words is "thirteen million, seven hundred twenty-three thousand, three hundred twenty-one".