8240009 has 4 divisors (see below), whose sum is σ = 8248320. Its totient is φ = 8231700.

The previous prime is 8239997. The next prime is 8240027. The reversal of 8240009 is 9000428.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8240009 - 2⁸ = 8239753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8240809) 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, 2429 + ... + 4730.

It is an arithmetic number, because the mean of its divisors is an integer number (2062080).

Almost surely, 2^8240009 is an apocalyptic number.

It is an amenable number.

8240009 is a deficient number, since it is larger than the sum of its proper divisors (8311).

8240009 is a wasteful number, since it uses less digits than its factorization.

8240009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 8240009 is about 2870.5415865303. The cubic root of 8240009 is about 201.9804003465.

The spelling of 8240009 in words is "eight million, two hundred forty thousand, nine".