2165660 has 48 divisors (see below), whose sum is σ = 5376000. Its totient is φ = 717120.

The previous prime is 2165659. The next prime is 2165663. The reversal of 2165660 is 665612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4091 + ... + 4589.

It is an arithmetic number, because the mean of its divisors is an integer number (112000).

2^2165660 is an apocalyptic number.

2165660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2165660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2688000).

2165660 is an abundant number, since it is smaller than the sum of its proper divisors (3210340).

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

2165660 is a wasteful number, since it uses less digits than its factorization.

2165660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2165660 is about 1471.6181569959. The cubic root of 2165660 is about 129.3788912612.

The spelling of 2165660 in words is "two million, one hundred sixty-five thousand, six hundred sixty".