2161240 has 32 divisors (see below), whose sum is σ = 4937760. Its totient is φ = 851200.

The previous prime is 2161213. The next prime is 2161253. The reversal of 2161240 is 421612.

2161240 = 360² + 361² + ... + 375².

2161240 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2460 + ... + 3220.

It is an arithmetic number, because the mean of its divisors is an integer number (154305).

2^2161240 is an apocalyptic number.

2161240 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 2161240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2468880).

2161240 is an abundant number, since it is smaller than the sum of its proper divisors (2776520).

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

2161240 is a wasteful number, since it uses less digits than its factorization.

2161240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2161240 is about 1470.1156417099. The cubic root of 2161240 is about 129.2908127720.

Adding to 2161240 its reverse (421612), we get a palindrome (2582852).

It can be divided in two parts, 2161 and 240, that added together give a 4-th power (2401 = 7⁴).

The spelling of 2161240 in words is "two million, one hundred sixty-one thousand, two hundred forty".