2166918 has 24 divisors (see below), whose sum is σ = 4695048. Its totient is φ = 666432.

The previous prime is 2166917. The next prime is 2166919. The reversal of 2166918 is 8196612.

It is an interprime number because it is at equal distance from previous prime (2166917) and next prime (2166919).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (195627).

2^2166918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2347524).

2166918 is an abundant number, since it is smaller than the sum of its proper divisors (2528130).

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

2166918 is a wasteful number, since it uses less digits than its factorization.

2166918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168 (or 2155 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 2166918 is about 1472.0455156007. The cubic root of 2166918 is about 129.4039378430.

The spelling of 2166918 in words is "two million, one hundred sixty-six thousand, nine hundred eighteen".