8243539 has 4 divisors (see below), whose sum is σ = 8383320. Its totient is φ = 8103760.

The previous prime is 8243537. The next prime is 8243579. The reversal of 8243539 is 9353428.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8243539 - 2¹ = 8243537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8243531) 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, 69802 + ... + 69919.

It is an arithmetic number, because the mean of its divisors is an integer number (2095830).

Almost surely, 2^8243539 is an apocalyptic number.

8243539 is a deficient number, since it is larger than the sum of its proper divisors (139781).

8243539 is a wasteful number, since it uses less digits than its factorization.

8243539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139780.

The product of its digits is 25920, while the sum is 34.

The square root of 8243539 is about 2871.1563872419. The cubic root of 8243539 is about 202.0092388677.

The spelling of 8243539 in words is "eight million, two hundred forty-three thousand, five hundred thirty-nine".