6439003421 has 2 divisors, whose sum is σ = 6439003422. Its totient is φ = 6439003420.

The previous prime is 6439003379. The next prime is 6439003447. The reversal of 6439003421 is 1243009346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4832196196 + 1606807225 = 69514^2 + 40085^2 .

It is a cyclic number.

It is not a de Polignac number, because 6439003421 - 2³⁰ = 5365261597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6439003321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219501710 + 3219501711.

It is an arithmetic number, because the mean of its divisors is an integer number (3219501711).

Almost surely, 2^6439003421 is an apocalyptic number.

It is an amenable number.

6439003421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6439003421 is an equidigital number, since it uses as much as digits as its factorization.

6439003421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 6439003421 is about 80243.4011056361. The cubic root of 6439003421 is about 1860.3995192393.

The spelling of 6439003421 in words is "six billion, four hundred thirty-nine million, three thousand, four hundred twenty-one".