439320221 has 2 divisors, whose sum is σ = 439320222. Its totient is φ = 439320220.

The previous prime is 439320199. The next prime is 439320253. The reversal of 439320221 is 122023934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377524900 + 61795321 = 19430^2 + 7861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439320221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439320281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219660110 + 219660111.

It is an arithmetic number, because the mean of its divisors is an integer number (219660111).

Almost surely, 2^439320221 is an apocalyptic number.

It is an amenable number.

439320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

439320221 is an equidigital number, since it uses as much as digits as its factorization.

439320221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 439320221 is about 20959.9671039818. The cubic root of 439320221 is about 760.1985982607.

The spelling of 439320221 in words is "four hundred thirty-nine million, three hundred twenty thousand, two hundred twenty-one".