6647838 has 16 divisors (see below), whose sum is σ = 13336320. Its totient is φ = 2209176.

The previous prime is 6647831. The next prime is 6647869. The reversal of 6647838 is 8387466.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6647838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647831) 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 7 ways as a sum of consecutive naturals, for example, 693 + ... + 3711.

It is an arithmetic number, because the mean of its divisors is an integer number (833520).

Almost surely, 2^6647838 is an apocalyptic number.

6647838 is an abundant number, since it is smaller than the sum of its proper divisors (6688482).

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

6647838 is a wasteful number, since it uses less digits than its factorization.

6647838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391.

The product of its digits is 193536, while the sum is 42.

The square root of 6647838 is about 2578.3401637488. The cubic root of 6647838 is about 188.0298541695.

The spelling of 6647838 in words is "six million, six hundred forty-seven thousand, eight hundred thirty-eight".