839238217 has 4 divisors (see below), whose sum is σ = 839499460. Its totient is φ = 838976976.

The previous prime is 839238193. The next prime is 839238229. The reversal of 839238217 is 712832938.

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

It can be written as a sum of positive squares in 2 ways, for example, as 537729721 + 301508496 = 23189^2 + 17364^2 .

It is a cyclic number.

It is not a de Polignac number, because 839238217 - 2¹⁵ = 839205449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839238287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125742 + ... + 132247.

It is an arithmetic number, because the mean of its divisors is an integer number (209874865).

Almost surely, 2^839238217 is an apocalyptic number.

It is an amenable number.

839238217 is a deficient number, since it is larger than the sum of its proper divisors (261243).

839238217 is a wasteful number, since it uses less digits than its factorization.

839238217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261242.

The product of its digits is 145152, while the sum is 43.

The square root of 839238217 is about 28969.6085061569. The cubic root of 839238217 is about 943.2534828866.

The spelling of 839238217 in words is "eight hundred thirty-nine million, two hundred thirty-eight thousand, two hundred seventeen".