8197809 has 4 divisors (see below), whose sum is σ = 10930416. Its totient is φ = 5465204.

The previous prime is 8197801. The next prime is 8197817. The reversal of 8197809 is 9087918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8197801) and next prime (8197817).

It is a cyclic number.

It is not a de Polignac number, because 8197809 - 2³ = 8197801 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (8197801) 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, 1366299 + ... + 1366304.

It is an arithmetic number, because the mean of its divisors is an integer number (2732604).

Almost surely, 2^8197809 is an apocalyptic number.

It is an amenable number.

8197809 is a deficient number, since it is larger than the sum of its proper divisors (2732607).

8197809 is a wasteful number, since it uses less digits than its factorization.

8197809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732606.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 8197809 is about 2863.1816219025. The cubic root of 8197809 is about 201.6350056922.

The spelling of 8197809 in words is "eight million, one hundred ninety-seven thousand, eight hundred nine".