8240209 has 4 divisors (see below), whose sum is σ = 8264304. Its totient is φ = 8216116.

The previous prime is 8240179. The next prime is 8240213. The reversal of 8240209 is 9020428.

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 8240209 - 2⁷ = 8240081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8240249) 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, 11527 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (2066076).

Almost surely, 2^8240209 is an apocalyptic number.

It is an amenable number.

8240209 is a deficient number, since it is larger than the sum of its proper divisors (24095).

8240209 is a wasteful number, since it uses less digits than its factorization.

8240209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24094.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 8240209 is about 2870.5764229506. The cubic root of 8240209 is about 201.9820344771.

The spelling of 8240209 in words is "eight million, two hundred forty thousand, two hundred nine".