13847721 has 8 divisors (see below), whose sum is σ = 18558144. Its totient is φ = 9184560.

The previous prime is 13847711. The next prime is 13847723. The reversal of 13847721 is 12774831.

It is a happy number.

13847721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13847721 - 2⁷ = 13847593 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13847723) 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, 11125 + ... + 12306.

It is an arithmetic number, because the mean of its divisors is an integer number (2319768).

Almost surely, 2^13847721 is an apocalyptic number.

It is an amenable number.

13847721 is a deficient number, since it is larger than the sum of its proper divisors (4710423).

13847721 is a wasteful number, since it uses less digits than its factorization.

13847721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23631.

The product of its digits is 9408, while the sum is 33.

The square root of 13847721 is about 3721.2526116887. The cubic root of 13847721 is about 240.1371958627.

The spelling of 13847721 in words is "thirteen million, eight hundred forty-seven thousand, seven hundred twenty-one".