6442943839 has 8 divisors (see below), whose sum is σ = 6724886400. Its totient is φ = 6161152536.

The previous prime is 6442943809. The next prime is 6442943861. The reversal of 6442943839 is 9383492446.

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 6442943839 - 2⁷ = 6442943711 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 (6442943809) 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, 54012 + ... + 125710.

It is an arithmetic number, because the mean of its divisors is an integer number (840610800).

Almost surely, 2^6442943839 is an apocalyptic number.

6442943839 is a deficient number, since it is larger than the sum of its proper divisors (281942561).

6442943839 is a wasteful number, since it uses less digits than its factorization.

6442943839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75629.

The product of its digits is 4478976, while the sum is 52.

The square root of 6442943839 is about 80267.9502603623. The cubic root of 6442943839 is about 1860.7789390762.

The spelling of 6442943839 in words is "six billion, four hundred forty-two million, nine hundred forty-three thousand, eight hundred thirty-nine".