6659940 has 96 divisors (see below), whose sum is σ = 21659904. Its totient is φ = 1497600.

The previous prime is 6659929. The next prime is 6659941. The reversal of 6659940 is 499566.

It is not an unprimeable number, because it can be changed into a prime (6659941) 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 31 ways as a sum of consecutive naturals, for example, 42342 + ... + 42498.

It is an arithmetic number, because the mean of its divisors is an integer number (225624).

Almost surely, 2^6659940 is an apocalyptic number.

6659940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6659940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10829952).

6659940 is an abundant number, since it is smaller than the sum of its proper divisors (14999964).

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

6659940 is a wasteful number, since it uses less digits than its factorization.

6659940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 6659940 is about 2580.6859553227. The cubic root of 6659940 is about 188.1438841174.

It can be divided in two parts, 66 and 59940, that added together give a palindrome (60006).

The spelling of 6659940 in words is "six million, six hundred fifty-nine thousand, nine hundred forty".