6686442 has 96 divisors (see below), whose sum is σ = 18288000. Its totient is φ = 1809864.

The previous prime is 6686437. The next prime is 6686447. The reversal of 6686442 is 2446866.

It is a happy number.

6686442 is a `hidden beast` number, since 6 + 6 + 8 + 644 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (6686437) and next prime (6686447).

It is a junction number, because it is equal to n+sod(n) for n = 6686397 and 6686406.

It is not an unprimeable number, because it can be changed into a prime (6686447) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 351909 + ... + 351927.

It is an arithmetic number, because the mean of its divisors is an integer number (190500).

Almost surely, 2^6686442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6686442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9144000).

6686442 is an abundant number, since it is smaller than the sum of its proper divisors (11601558).

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

6686442 is a wasteful number, since it uses less digits than its factorization.

6686442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 31 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 6686442 is about 2585.8155386647. The cubic root of 6686442 is about 188.3931150878.

The spelling of 6686442 in words is "six million, six hundred eighty-six thousand, four hundred forty-two".