2186666 has 8 divisors (see below), whose sum is σ = 3291300. Its totient is φ = 1089568.

The previous prime is 2186651. The next prime is 2186677. The reversal of 2186666 is 6666812.

2186666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1428025 + 758641 = 1195^2 + 871^2 .

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

2186666 is a modest number, since divided by 6666 gives 218 as remainder.

It is a Curzon number.

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, 1091 + ... + 2358.

2^2186666 is an apocalyptic number.

2186666 is a deficient number, since it is larger than the sum of its proper divisors (1104634).

2186666 is a wasteful number, since it uses less digits than its factorization.

2186666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3768.

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

The square root of 2186666 is about 1478.7379754372. The cubic root of 2186666 is about 129.7958531537.

The spelling of 2186666 in words is "two million, one hundred eighty-six thousand, six hundred sixty-six".