6439371705 has 24 divisors (see below), whose sum is σ = 12020161608. Its totient is φ = 3170151936.

The previous prime is 6439371703. The next prime is 6439371713. The reversal of 6439371705 is 5071739346.

It can be written as a sum of positive squares in 4 ways, for example, as 666259344 + 5773112361 = 25812^2 + 75981^2 .

It is not a de Polignac number, because 6439371705 - 2¹ = 6439371703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (6439371703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5503152 + ... + 5504321.

It is an arithmetic number, because the mean of its divisors is an integer number (500840067).

Almost surely, 2^6439371705 is an apocalyptic number.

6439371705 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6439371705 is a deficient number, since it is larger than the sum of its proper divisors (5580789903).

6439371705 is a wasteful number, since it uses less digits than its factorization.

6439371705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11007497 (or 11007494 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 45.

The square root of 6439371705 is about 80245.6958658843. The cubic root of 6439371705 is about 1860.4349875807.

The spelling of 6439371705 in words is "six billion, four hundred thirty-nine million, three hundred seventy-one thousand, seven hundred five".