6866891 has 8 divisors (see below), whose sum is σ = 7032960. Its totient is φ = 6702912.

The previous prime is 6866887. The next prime is 6866927. The reversal of 6866891 is 1986686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6866891 - 2² = 6866887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6866801) 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 7 ways as a sum of consecutive naturals, for example, 7526 + ... + 8388.

It is an arithmetic number, because the mean of its divisors is an integer number (879120).

Almost surely, 2^6866891 is an apocalyptic number.

6866891 is a deficient number, since it is larger than the sum of its proper divisors (166069).

6866891 is a wasteful number, since it uses less digits than its factorization.

6866891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045.

The product of its digits is 124416, while the sum is 44.

The square root of 6866891 is about 2620.4753385598. The cubic root of 6866891 is about 190.0728344953.

The spelling of 6866891 in words is "six million, eight hundred sixty-six thousand, eight hundred ninety-one".