439842638321 has 2 divisors, whose sum is σ = 439842638322. Its totient is φ = 439842638320.

The previous prime is 439842638311. The next prime is 439842638351. The reversal of 439842638321 is 123836248934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421929492721 + 17913145600 = 649561^2 + 133840^2 .

It is a cyclic number.

It is not a de Polignac number, because 439842638321 - 2¹⁴ = 439842621937 is a prime.

It is not a weakly prime, because it can be changed into another prime (439842638311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219921319160 + 219921319161.

It is an arithmetic number, because the mean of its divisors is an integer number (219921319161).

Almost surely, 2^439842638321 is an apocalyptic number.

It is an amenable number.

439842638321 is a deficient number, since it is larger than the sum of its proper divisors (1).

439842638321 is an equidigital number, since it uses as much as digits as its factorization.

439842638321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 53.

The spelling of 439842638321 in words is "four hundred thirty-nine billion, eight hundred forty-two million, six hundred thirty-eight thousand, three hundred twenty-one".