6649986 has 24 divisors (see below), whose sum is σ = 15472080. Its totient is φ = 1899912.

The previous prime is 6649919. The next prime is 6649999. The reversal of 6649986 is 6899466.

It is a super-3 number, since 3×6649986³ (a number of 21 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11016 + ... + 11603.

It is an arithmetic number, because the mean of its divisors is an integer number (644670).

Almost surely, 2^6649986 is an apocalyptic number.

6649986 is an abundant number, since it is smaller than the sum of its proper divisors (8822094).

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

6649986 is a wasteful number, since it uses less digits than its factorization.

6649986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22638 (or 22631 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 6649986 is about 2578.7566771605. The cubic root of 6649986 is about 188.0501035916.

The spelling of 6649986 in words is "six million, six hundred forty-nine thousand, nine hundred eighty-six".