8243409 has 4 divisors (see below), whose sum is σ = 10991216. Its totient is φ = 5495604.

The previous prime is 8243393. The next prime is 8243423. The reversal of 8243409 is 9043428.

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 not a de Polignac number, because 8243409 - 2⁴ = 8243393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8243429) 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, 1373899 + ... + 1373904.

It is an arithmetic number, because the mean of its divisors is an integer number (2747804).

Almost surely, 2^8243409 is an apocalyptic number.

It is an amenable number.

8243409 is a deficient number, since it is larger than the sum of its proper divisors (2747807).

8243409 is a wasteful number, since it uses less digits than its factorization.

8243409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747806.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 8243409 is about 2871.1337481908. The cubic root of 8243409 is about 202.0081769719.

The spelling of 8243409 in words is "eight million, two hundred forty-three thousand, four hundred nine".