2166606 has 48 divisors (see below), whose sum is σ = 5189184. Its totient is φ = 649152.

The previous prime is 2166601. The next prime is 2166607. The reversal of 2166606 is 6066612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10900 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^2166606 is an apocalyptic number.

2166606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594592).

2166606 is an abundant number, since it is smaller than the sum of its proper divisors (3022578).

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

2166606 is a wasteful number, since it uses less digits than its factorization.

2166606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 262 counting only the distinct ones).

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

The square root of 2166606 is about 1471.9395368017. The cubic root of 2166606 is about 129.3977268763.

It can be divided in two parts, 2166 and 606, that added together give a palindrome (2772).

The spelling of 2166606 in words is "two million, one hundred sixty-six thousand, six hundred six".