6649918 has 12 divisors (see below), whose sum is σ = 10964520. Its totient is φ = 3022580.

The previous prime is 6649901. The next prime is 6649919. The reversal of 6649918 is 8199466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649919) 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 5 ways as a sum of consecutive naturals, for example, 13498 + ... + 13981.

It is an arithmetic number, because the mean of its divisors is an integer number (913710).

Almost surely, 2^6649918 is an apocalyptic number.

6649918 is a deficient number, since it is larger than the sum of its proper divisors (4314602).

6649918 is a wasteful number, since it uses less digits than its factorization.

6649918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27503 (or 27492 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 6649918 is about 2578.7434924785. The cubic root of 6649918 is about 188.0494626153.

The spelling of 6649918 in words is "six million, six hundred forty-nine thousand, nine hundred eighteen".