2173530240 has 768 divisors, whose sum is σ = 9544262400. Its totient is φ = 464486400.

The previous prime is 2173530211. The next prime is 2173530241. The reversal of 2173530240 is 420353712.

2173530240 is a `hidden beast` number, since 21 + 73 + 530 + 2 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173530241) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14394165 + ... + 14394315.

It is an arithmetic number, because the mean of its divisors is an integer number (12427425).

Almost surely, 2^2173530240 is an apocalyptic number.

2173530240 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 2173530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4772131200).

2173530240 is an abundant number, since it is smaller than the sum of its proper divisors (7370732160).

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

2173530240 is a wasteful number, since it uses less digits than its factorization.

2173530240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 2173530240 is about 46621.1351213160. The cubic root of 2173530240 is about 1295.3542736592.

Adding to 2173530240 its reverse (420353712), we get a palindrome (2593883952).

The spelling of 2173530240 in words is "two billion, one hundred seventy-three million, five hundred thirty thousand, two hundred forty".