6438475439 has 8 divisors (see below), whose sum is σ = 7079098368. Its totient is φ = 5807070360.

The previous prime is 6438475411. The next prime is 6438475481. The reversal of 6438475439 is 9345748346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438475439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438475499) 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, 2302997 + ... + 2305790.

It is an arithmetic number, because the mean of its divisors is an integer number (884887296).

Almost surely, 2^6438475439 is an apocalyptic number.

6438475439 is a deficient number, since it is larger than the sum of its proper divisors (640622929).

6438475439 is a wasteful number, since it uses less digits than its factorization.

6438475439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608925.

The product of its digits is 8709120, while the sum is 53.

The square root of 6438475439 is about 80240.1111601922. Note that the first 4 decimals coincide. The cubic root of 6438475439 is about 1860.3486684972.

The spelling of 6438475439 in words is "six billion, four hundred thirty-eight million, four hundred seventy-five thousand, four hundred thirty-nine".