8720239 has 16 divisors (see below), whose sum is σ = 9870336. Its totient is φ = 7636000.

The previous prime is 8720233. The next prime is 8720281. The reversal of 8720239 is 9320278.

8720239 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8720239 - 2⁷ = 8720111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8720239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52134 + ... + 52300.

It is an arithmetic number, because the mean of its divisors is an integer number (616896).

Almost surely, 2^8720239 is an apocalyptic number.

8720239 is a deficient number, since it is larger than the sum of its proper divisors (1150097).

8720239 is a wasteful number, since it uses less digits than its factorization.

8720239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 8720239 is about 2953.0050795757. The cubic root of 8720239 is about 205.8303737639.

The spelling of 8720239 in words is "eight million, seven hundred twenty thousand, two hundred thirty-nine".