6439938 has 32 divisors (see below), whose sum is σ = 13358400. Its totient is φ = 2068416.

The previous prime is 6439933. The next prime is 6439949. The reversal of 6439938 is 8399346.

It is a self number, because there is not a number n which added to its sum of digits gives 6439938.

It is not an unprimeable number, because it can be changed into a prime (6439933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28008 + ... + 28236.

It is an arithmetic number, because the mean of its divisors is an integer number (417450).

Almost surely, 2^6439938 is an apocalyptic number.

6439938 is an abundant number, since it is smaller than the sum of its proper divisors (6918462).

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

6439938 is a wasteful number, since it uses less digits than its factorization.

6439938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its digits is 139968, while the sum is 42.

The square root of 6439938 is about 2537.7032923492. The cubic root of 6439938 is about 186.0489523137.

The spelling of 6439938 in words is "six million, four hundred thirty-nine thousand, nine hundred thirty-eight".