2166686 has 8 divisors (see below), whose sum is σ = 3329424. Its totient is φ = 1056880.

The previous prime is 2166679. The next prime is 2166691. The reversal of 2166686 is 6866612.

2166686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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 3 ways as a sum of consecutive naturals, for example, 13130 + ... + 13293.

It is an arithmetic number, because the mean of its divisors is an integer number (416178).

2^2166686 is an apocalyptic number.

2166686 is a deficient number, since it is larger than the sum of its proper divisors (1162738).

2166686 is a wasteful number, since it uses less digits than its factorization.

2166686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26466.

The product of its digits is 20736, while the sum is 35.

The square root of 2166686 is about 1471.9667115801. The cubic root of 2166686 is about 129.3993194887.

The spelling of 2166686 in words is "two million, one hundred sixty-six thousand, six hundred eighty-six".