839382221 has 2 divisors, whose sum is σ = 839382222. Its totient is φ = 839382220.

The previous prime is 839382211. The next prime is 839382223. The reversal of 839382221 is 122283938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 696220996 + 143161225 = 26386^2 + 11965^2 .

It is a cyclic number.

It is not a de Polignac number, because 839382221 - 2¹⁰ = 839381197 is a prime.

It is a Sophie Germain prime.

Together with 839382223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (839382223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419691110 + 419691111.

It is an arithmetic number, because the mean of its divisors is an integer number (419691111).

Almost surely, 2^839382221 is an apocalyptic number.

It is an amenable number.

839382221 is a deficient number, since it is larger than the sum of its proper divisors (1).

839382221 is an equidigital number, since it uses as much as digits as its factorization.

839382221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 839382221 is about 28972.0938318238. The cubic root of 839382221 is about 943.3074304244.

The spelling of 839382221 in words is "eight hundred thirty-nine million, three hundred eighty-two thousand, two hundred twenty-one".