8204509 has 4 divisors (see below), whose sum is σ = 8216640. Its totient is φ = 8192380.

The previous prime is 8204507. The next prime is 8204513. The reversal of 8204509 is 9054028.

It is a happy number.

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 8204509 - 2¹ = 8204507 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 (8204501) 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, 4987 + ... + 6424.

It is an arithmetic number, because the mean of its divisors is an integer number (2054160).

Almost surely, 2^8204509 is an apocalyptic number.

It is an amenable number.

8204509 is a deficient number, since it is larger than the sum of its proper divisors (12131).

8204509 is a wasteful number, since it uses less digits than its factorization.

8204509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12130.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 8204509 is about 2864.3514100054. The cubic root of 8204509 is about 201.6899222625.

It can be divided in two parts, 820 and 4509, that added together give a square (5329 = 73²).

The spelling of 8204509 in words is "eight million, two hundred four thousand, five hundred nine".