8210009 has 4 divisors (see below), whose sum is σ = 8474880. Its totient is φ = 7945140.

The previous prime is 8209991. The next prime is 8210017. The reversal of 8210009 is 9000128.

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 a cyclic number.

It is not a de Polignac number, because 8210009 - 2¹² = 8205913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8210309) 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, 132389 + ... + 132450.

It is an arithmetic number, because the mean of its divisors is an integer number (2118720).

Almost surely, 2^8210009 is an apocalyptic number.

It is an amenable number.

8210009 is a deficient number, since it is larger than the sum of its proper divisors (264871).

8210009 is a wasteful number, since it uses less digits than its factorization.

8210009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264870.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 8210009 is about 2865.3113268893. The cubic root of 8210009 is about 201.7349806887.

The spelling of 8210009 in words is "eight million, two hundred ten thousand, nine".