6439486321 has 8 divisors (see below), whose sum is σ = 6864042600. Its totient is φ = 6020014848.

The previous prime is 6439486301. The next prime is 6439486367. The reversal of 6439486321 is 1236849346.

It can be written as a sum of positive squares in 4 ways, for example, as 204804721 + 6234681600 = 14311^2 + 78960^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6439486321 - 2¹¹ = 6439484273 is a prime.

It is a super-2 number, since 2×6439486321² = 82933968156692230082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6439486301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1268586 + ... + 1273651.

It is an arithmetic number, because the mean of its divisors is an integer number (858005325).

Almost surely, 2^6439486321 is an apocalyptic number.

It is an amenable number.

6439486321 is a deficient number, since it is larger than the sum of its proper divisors (424556279).

6439486321 is a wasteful number, since it uses less digits than its factorization.

6439486321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542403.

The product of its digits is 746496, while the sum is 46.

The square root of 6439486321 is about 80246.4100193897. The cubic root of 6439486321 is about 1860.4460256323.

The spelling of 6439486321 in words is "six billion, four hundred thirty-nine million, four hundred eighty-six thousand, three hundred twenty-one".