8721339 has 8 divisors (see below), whose sum is σ = 12685632. Its totient is φ = 5285640.

The previous prime is 8721329. The next prime is 8721359. The reversal of 8721339 is 9331278.

8721339 is digitally balanced in base 2, base 3 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 8721339 - 2¹⁵ = 8688571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 264283 = 8721339 / (8 + 7 + 2 + 1 + 3 + 3 + 9).

It is not an unprimeable number, because it can be changed into a prime (8721329) 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, 132109 + ... + 132174.

It is an arithmetic number, because the mean of its divisors is an integer number (1585704).

Almost surely, 2^8721339 is an apocalyptic number.

8721339 is a deficient number, since it is larger than the sum of its proper divisors (3964293).

8721339 is a wasteful number, since it uses less digits than its factorization.

8721339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264297.

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

The square root of 8721339 is about 2953.1913246520. The cubic root of 8721339 is about 205.8390281097.

It can be divided in two parts, 872 and 1339, that added together give a triangular number (2211 = T₆₆).

The spelling of 8721339 in words is "eight million, seven hundred twenty-one thousand, three hundred thirty-nine".