6644938 has 8 divisors (see below), whose sum is σ = 9979200. Its totient is φ = 3318540.

The previous prime is 6644933. The next prime is 6644959. The reversal of 6644938 is 8394466.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6644938.

It is not an unprimeable number, because it can be changed into a prime (6644933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113 + ... + 3811.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^6644938 is an apocalyptic number.

6644938 is a deficient number, since it is larger than the sum of its proper divisors (3334262).

6644938 is a wasteful number, since it uses less digits than its factorization.

6644938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932.

The product of its digits is 124416, while the sum is 40.

The square root of 6644938 is about 2577.7777250958. Note that the first 4 decimals coincide. The cubic root of 6644938 is about 188.0025086432.

The spelling of 6644938 in words is "six million, six hundred forty-four thousand, nine hundred thirty-eight".