8197309 has 4 divisors (see below), whose sum is σ = 8242780. Its totient is φ = 8151840.

The previous prime is 8197297. The next prime is 8197327. The reversal of 8197309 is 9037918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9037918 = 2 ⋅4518959.

It can be written as a sum of positive squares in 2 ways, for example, as 2805625 + 5391684 = 1675^2 + 2322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8197309 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 (8197339) 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, 22464 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (2060695).

Almost surely, 2^8197309 is an apocalyptic number.

It is an amenable number.

8197309 is a deficient number, since it is larger than the sum of its proper divisors (45471).

8197309 is a wasteful number, since it uses less digits than its factorization.

8197309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45470.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 8197309 is about 2863.0943051182. The cubic root of 8197309 is about 201.6309062410.

It can be divided in two parts, 819 and 7309, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 8197309 in words is "eight million, one hundred ninety-seven thousand, three hundred nine".