439789421 has 2 divisors, whose sum is σ = 439789422. Its totient is φ = 439789420.

The previous prime is 439789393. The next prime is 439789477. The reversal of 439789421 is 124987934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363855625 + 75933796 = 19075^2 + 8714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439789421 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 (439789121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219894710 + 219894711.

It is an arithmetic number, because the mean of its divisors is an integer number (219894711).

Almost surely, 2^439789421 is an apocalyptic number.

It is an amenable number.

439789421 is a deficient number, since it is larger than the sum of its proper divisors (1).

439789421 is an equidigital number, since it uses as much as digits as its factorization.

439789421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 439789421 is about 20971.1568827282. The cubic root of 439789421 is about 760.4691361349.

The spelling of 439789421 in words is "four hundred thirty-nine million, seven hundred eighty-nine thousand, four hundred twenty-one".