8728399 has 4 divisors (see below), whose sum is σ = 8795160. Its totient is φ = 8661640.

The previous prime is 8728397. The next prime is 8728427. The reversal of 8728399 is 9938278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8728399 - 2¹ = 8728397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728397) 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 3 ways as a sum of consecutive naturals, for example, 33184 + ... + 33445.

It is an arithmetic number, because the mean of its divisors is an integer number (2198790).

Almost surely, 2^8728399 is an apocalyptic number.

8728399 is a deficient number, since it is larger than the sum of its proper divisors (66761).

8728399 is a wasteful number, since it uses less digits than its factorization.

8728399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66760.

The product of its digits is 217728, while the sum is 46.

The square root of 8728399 is about 2954.3863999145. The cubic root of 8728399 is about 205.8945559586.

The spelling of 8728399 in words is "eight million, seven hundred twenty-eight thousand, three hundred ninety-nine".