6439430420 has 24 divisors (see below), whose sum is σ = 13888286664. Its totient is φ = 2506156416.

The previous prime is 6439430419. The next prime is 6439430423. The reversal of 6439430420 is 240349346.

It can be written as a sum of positive squares in 4 ways, for example, as 833015044 + 5606415376 = 28862^2 + 74876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439430423) 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 7 ways as a sum of consecutive naturals, for example, 4350227 + ... + 4351706.

It is an arithmetic number, because the mean of its divisors is an integer number (578678611).

Almost surely, 2^6439430420 is an apocalyptic number.

It is an amenable number.

6439430420 is an abundant number, since it is smaller than the sum of its proper divisors (7448856244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6439430420 is a wasteful number, since it uses less digits than its factorization.

6439430420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701979 (or 8701977 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 6439430420 is about 80246.0617102173. The cubic root of 6439430420 is about 1860.4406421235.

Adding to 6439430420 its reverse (240349346), we get a palindrome (6679779766).

The spelling of 6439430420 in words is "six billion, four hundred thirty-nine million, four hundred thirty thousand, four hundred twenty".