8399309 has 4 divisors (see below), whose sum is σ = 8893404. Its totient is φ = 7905216.

The previous prime is 8399297. The next prime is 8399317. The reversal of 8399309 is 9039938.

8399309 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.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 990025 = 2722^2 + 995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8399309 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 (8393309) 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, 247022 + ... + 247055.

It is an arithmetic number, because the mean of its divisors is an integer number (2223351).

Almost surely, 2^8399309 is an apocalyptic number.

It is an amenable number.

8399309 is a deficient number, since it is larger than the sum of its proper divisors (494095).

8399309 is a wasteful number, since it uses less digits than its factorization.

8399309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494094.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 8399309 is about 2898.1561379608. The cubic root of 8399309 is about 203.2736971634.

The spelling of 8399309 in words is "eight million, three hundred ninety-nine thousand, three hundred nine".