8040209 has 4 divisors (see below), whose sum is σ = 8047104. Its totient is φ = 8033316.

The previous prime is 8040169. The next prime is 8040217. The reversal of 8040209 is 9020408.

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 a de Polignac number, because none of the positive numbers 2^k-8040209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8040229) 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, 1217 + ... + 4190.

It is an arithmetic number, because the mean of its divisors is an integer number (2011776).

Almost surely, 2^8040209 is an apocalyptic number.

It is an amenable number.

8040209 is a deficient number, since it is larger than the sum of its proper divisors (6895).

8040209 is a wasteful number, since it uses less digits than its factorization.

8040209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894.

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

The square root of 8040209 is about 2835.5262298205. The cubic root of 8040209 is about 200.3345151860.

The spelling of 8040209 in words is "eight million, forty thousand, two hundred nine".