2106666 has 12 divisors (see below), whose sum is σ = 4564482. Its totient is φ = 702216.

The previous prime is 2106653. The next prime is 2106673. The reversal of 2106666 is 6666012.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 772641 = 1155^2 + 879^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

2106666 is a modest number, since divided by 6666 gives 210 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58501 + ... + 58536.

2^2106666 is an apocalyptic number.

2106666 is an abundant number, since it is smaller than the sum of its proper divisors (2457816).

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

2106666 is a wasteful number, since it uses less digits than its factorization.

2106666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117045 (or 117042 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 2106666 is about 1451.4358408142. The cubic root of 2106666 is about 128.1932708535.

It can be divided in two parts, 2106 and 666, that added together give a palindrome (2772).

The spelling of 2106666 in words is "two million, one hundred six thousand, six hundred sixty-six".