8243139 has 4 divisors (see below), whose sum is σ = 10990856. Its totient is φ = 5495424.

The previous prime is 8243107. The next prime is 8243149. The reversal of 8243139 is 9313428.

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

It is not a de Polignac number, because 8243139 - 2⁵ = 8243107 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8243149) 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, 1373854 + ... + 1373859.

It is an arithmetic number, because the mean of its divisors is an integer number (2747714).

Almost surely, 2^8243139 is an apocalyptic number.

8243139 is a deficient number, since it is larger than the sum of its proper divisors (2747717).

8243139 is a wasteful number, since it uses less digits than its factorization.

8243139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747716.

The product of its digits is 5184, while the sum is 30.

The square root of 8243139 is about 2871.0867280526. The cubic root of 8243139 is about 202.0059714602.

The spelling of 8243139 in words is "eight million, two hundred forty-three thousand, one hundred thirty-nine".