2166588 has 42 divisors (see below), whose sum is σ = 5692344. Its totient is φ = 721224.

The previous prime is 2166581. The next prime is 2166601. The reversal of 2166588 is 8856612.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166581) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 2545 + ... + 3287.

It is an arithmetic number, because the mean of its divisors is an integer number (135532).

2^2166588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2846172).

2166588 is an abundant number, since it is smaller than the sum of its proper divisors (3525756).

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

2166588 is an equidigital number, since it uses as much as digits as its factorization.

2166588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 748 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2166588 is about 1471.9334224074. The cubic root of 2166588 is about 129.3973685331.

The spelling of 2166588 in words is "two million, one hundred sixty-six thousand, five hundred eighty-eight".