6891966 has 56 divisors (see below), whose sum is σ = 16132680. Its totient is φ = 2204496.

The previous prime is 6891949. The next prime is 6891971. The reversal of 6891966 is 6691986.

It is a congruent number.

It is an unprimeable number.

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 27 ways as a sum of consecutive naturals, for example, 42201 + ... + 42363.

Almost surely, 2^6891966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6891966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8066340).

6891966 is an abundant number, since it is smaller than the sum of its proper divisors (9240714).

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

6891966 is a wasteful number, since it uses less digits than its factorization.

6891966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 197 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 6891966 is about 2625.2554161453. The cubic root of 6891966 is about 190.3039088310.

The spelling of 6891966 in words is "six million, eight hundred ninety-one thousand, nine hundred sixty-six".