6438939050 has 24 divisors (see below), whose sum is σ = 11981069100. Its totient is φ = 2574577280.

The previous prime is 6438939043. The next prime is 6438939061. The reversal of 6438939050 is 509398346.

It is a Cunningham number, because it is equal to 80243²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 5934083089 + 504855961 = 77033^2 + 22469^2 .

It is a super-2 number, since 2×6438939050² = 82919872179229805000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6438938986 and 6438939004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112856 + ... + 160044.

Almost surely, 2^6438939050 is an apocalyptic number.

6438939050 is a deficient number, since it is larger than the sum of its proper divisors (5542130050).

6438939050 is a wasteful number, since it uses less digits than its factorization.

6438939050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49930 (or 49925 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 6438939050 is about 80243.0000062311. Note that the first 5 decimals coincide. The cubic root of 6438939050 is about 1860.3933197201.

The spelling of 6438939050 in words is "six billion, four hundred thirty-eight million, nine hundred thirty-nine thousand, fifty".