8339721 has 16 divisors (see below), whose sum is σ = 12255936. Its totient is φ = 5011776.

The previous prime is 8339717. The next prime is 8339729. The reversal of 8339721 is 1279338.

It is not a de Polignac number, because 8339721 - 2² = 8339717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8339729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810 + ... + 4163.

It is an arithmetic number, because the mean of its divisors is an integer number (765996).

Almost surely, 2^8339721 is an apocalyptic number.

It is an amenable number.

8339721 is a deficient number, since it is larger than the sum of its proper divisors (3916215).

8339721 is a wasteful number, since it uses less digits than its factorization.

8339721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032.

The product of its digits is 9072, while the sum is 33.

The square root of 8339721 is about 2887.8575103353. The cubic root of 8339721 is about 202.7918547277.

The spelling of 8339721 in words is "eight million, three hundred thirty-nine thousand, seven hundred twenty-one".