8359721 has 4 divisors (see below), whose sum is σ = 8367744. Its totient is φ = 8351700.

The previous prime is 8359717. The next prime is 8359723. The reversal of 8359721 is 1279538.

8359721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8359721 - 2² = 8359717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8359723) 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, 2165 + ... + 4626.

It is an arithmetic number, because the mean of its divisors is an integer number (2091936).

Almost surely, 2^8359721 is an apocalyptic number.

It is an amenable number.

8359721 is a deficient number, since it is larger than the sum of its proper divisors (8023).

8359721 is a wasteful number, since it uses less digits than its factorization.

8359721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8022.

The product of its digits is 15120, while the sum is 35.

The square root of 8359721 is about 2891.3182114738. The cubic root of 8359721 is about 202.9538345359.

The spelling of 8359721 in words is "eight million, three hundred fifty-nine thousand, seven hundred twenty-one".