2166318 has 64 divisors (see below), whose sum is σ = 6013440. Its totient is φ = 561600.

The previous prime is 2166289. The next prime is 2166319. The reversal of 2166318 is 8136612.

2166318 is a `hidden beast` number, since 21 + 6 + 631 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 2166291 and 2166300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3898 + ... + 4418.

It is an arithmetic number, because the mean of its divisors is an integer number (93960).

2^2166318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3006720).

2166318 is an abundant number, since it is smaller than the sum of its proper divisors (3847122).

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

2166318 is a wasteful number, since it uses less digits than its factorization.

2166318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 2166318 is about 1471.8417034450. The cubic root of 2166318 is about 129.3919931470.

The spelling of 2166318 in words is "two million, one hundred sixty-six thousand, three hundred eighteen".