2161380 has 96 divisors (see below), whose sum is σ = 6943104. Its totient is φ = 497664.

The previous prime is 2161373. The next prime is 2161409. The reversal of 2161380 is 831612.

2161380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13179 + ... + 13341.

It is an arithmetic number, because the mean of its divisors is an integer number (72324).

2^2161380 is an apocalyptic number.

2161380 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 2161380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3471552).

2161380 is an abundant number, since it is smaller than the sum of its proper divisors (4781724).

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

2161380 is a wasteful number, since it uses less digits than its factorization.

2161380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2161380 is about 1470.1632562406. The cubic root of 2161380 is about 129.2936044291.

Adding to 2161380 its reverse (831612), we get a palindrome (2992992).

It can be divided in two parts, 216 and 1380, that added together give a triangular number (1596 = T₅₆).

The spelling of 2161380 in words is "two million, one hundred sixty-one thousand, three hundred eighty".