439683440021 has 24 divisors (see below), whose sum is σ = 512819424000. Its totient is φ = 375877005504.

The previous prime is 439683440003. The next prime is 439683440047. The reversal of 439683440021 is 120044386934.

It is not a de Polignac number, because 439683440021 - 2¹⁸ = 439683177877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439683440321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54894665 + ... + 54902673.

It is an arithmetic number, because the mean of its divisors is an integer number (21367476000).

Almost surely, 2^439683440021 is an apocalyptic number.

It is an amenable number.

439683440021 is a deficient number, since it is larger than the sum of its proper divisors (73135983979).

439683440021 is a wasteful number, since it uses less digits than its factorization.

439683440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10841 (or 10834 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 439683440021 in words is "four hundred thirty-nine billion, six hundred eighty-three million, four hundred forty thousand, twenty-one".