6378939 has 16 divisors (see below), whose sum is σ = 10800640. Its totient is φ = 3645000.

The previous prime is 6378937. The next prime is 6378947. The reversal of 6378939 is 9398736.

It is a happy number.

6378939 is a `hidden beast` number, since 637 + 8 + 9 + 3 + 9 = 666.

It is not a de Polignac number, because 6378939 - 2¹ = 6378937 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 3¹² + 7³ + 8 + 9⁶ + 3¹⁴ + 9⁶ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6378894 and 6378903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6378937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16687 + ... + 17064.

It is an arithmetic number, because the mean of its divisors is an integer number (675040).

Almost surely, 2^6378939 is an apocalyptic number.

6378939 is a deficient number, since it is larger than the sum of its proper divisors (4421701).

6378939 is a wasteful number, since it uses less digits than its factorization.

6378939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33767 (or 33761 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 6378939 is about 2525.6561523691. The cubic root of 6378939 is about 185.4596701557.

The spelling of 6378939 in words is "six million, three hundred seventy-eight thousand, nine hundred thirty-nine".