839221 has 2 divisors, whose sum is σ = 839222. Its totient is φ = 839220.

The previous prime is 839207. The next prime is 839227. The reversal of 839221 is 122938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 260100 = 761^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 839221 - 2¹⁵ = 806453 is a prime.

It is an Ulam number.

It is equal to p₆₆₈₃₂ and since 839221 and 66832 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (839227) 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 as a sum of consecutive naturals, namely, 419610 + 419611.

It is an arithmetic number, because the mean of its divisors is an integer number (419611).

2⁸³⁹²²¹ is an apocalyptic number.

It is an amenable number.

839221 is a deficient number, since it is larger than the sum of its proper divisors (1).

839221 is an equidigital number, since it uses as much as digits as its factorization.

839221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 839221 is about 916.0900610748. The cubic root of 839221 is about 94.3247032550.

The spelling of 839221 in words is "eight hundred thirty-nine thousand, two hundred twenty-one".