2161764 has 72 divisors (see below), whose sum is σ = 6132672. Its totient is φ = 636480.

The previous prime is 2161759. The next prime is 2161769. The reversal of 2161764 is 4671612.

2161764 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2161759) and next prime (2161769).

It is not an unprimeable number, because it can be changed into a prime (2161769) 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, 20937 + ... + 21039.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

2^2161764 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 2161764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3066336).

2161764 is an abundant number, since it is smaller than the sum of its proper divisors (3970908).

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

2161764 is a wasteful number, since it uses less digits than its factorization.

2161764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 172 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2161764 is about 1470.2938481814. The cubic root of 2161764 is about 129.3012609269.

The spelling of 2161764 in words is "two million, one hundred sixty-one thousand, seven hundred sixty-four".