6646239 has 16 divisors (see below), whose sum is σ = 9987840. Its totient is φ = 4367160.

The previous prime is 6646231. The next prime is 6646247. The reversal of 6646239 is 9326466.

6646239 is a `hidden beast` number, since 6 + 646 + 2 + 3 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (6646231) and next prime (6646247).

It is not a de Polignac number, because 6646239 - 2³ = 6646231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646231) 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, 184 + ... + 3650.

It is an arithmetic number, because the mean of its divisors is an integer number (624240).

Almost surely, 2^6646239 is an apocalyptic number.

6646239 is a deficient number, since it is larger than the sum of its proper divisors (3341601).

6646239 is a wasteful number, since it uses less digits than its factorization.

6646239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547 (or 3541 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 6646239 is about 2578.0300618883. The cubic root of 6646239 is about 188.0147773958.

It can be divided in two parts, 664 and 6239, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 6646239 in words is "six million, six hundred forty-six thousand, two hundred thirty-nine".