6639846 has 16 divisors (see below), whose sum is σ = 13305600. Its totient is φ = 2208968.

The previous prime is 6639839. The next prime is 6639851. The reversal of 6639846 is 6489366.

It is a d-powerful number, because it can be written as 6 + 6² + 3¹¹ + 9⁷ + 8 + 4³ + 6⁸ .

It is a junction number, because it is equal to n+sod(n) for n = 6639798 and 6639807.

It is a congruent number.

It is an unprimeable number.

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, 4375 + ... + 5693.

It is an arithmetic number, because the mean of its divisors is an integer number (831600).

Almost surely, 2^6639846 is an apocalyptic number.

6639846 is an abundant number, since it is smaller than the sum of its proper divisors (6665754).

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

6639846 is a wasteful number, since it uses less digits than its factorization.

6639846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163.

The product of its digits is 186624, while the sum is 42.

The square root of 6639846 is about 2576.7898633765. The cubic root of 6639846 is about 187.9544744149.

The spelling of 6639846 in words is "six million, six hundred thirty-nine thousand, eight hundred forty-six".