13703721 has 4 divisors (see below), whose sum is σ = 18271632. Its totient is φ = 9135812.

The previous prime is 13703719. The next prime is 13703741. The reversal of 13703721 is 12730731.

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 13703721 - 2¹ = 13703719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13703691 and 13703700.

It is not an unprimeable number, because it can be changed into a prime (13703741) 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, 2283951 + ... + 2283956.

It is an arithmetic number, because the mean of its divisors is an integer number (4567908).

Almost surely, 2^13703721 is an apocalyptic number.

It is an amenable number.

13703721 is a deficient number, since it is larger than the sum of its proper divisors (4567911).

13703721 is an equidigital number, since it uses as much as digits as its factorization.

13703721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567910.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 13703721 is about 3701.8537248249. The cubic root of 13703721 is about 239.3019124148.

The spelling of 13703721 in words is "thirteen million, seven hundred three thousand, seven hundred twenty-one".