2109840489 has 27 divisors (see below), whose sum is σ = 3110719287. Its totient is φ = 1377990000.

The previous prime is 2109840479. The next prime is 2109840511. The reversal of 2109840489 is 9840489012.

The square root of 2109840489 is 45933.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 68608089 + 2041232400 = 8283^2 + 45180^2 .

It is not a de Polignac number, because 2109840489 - 2⁵ = 2109840457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2109840479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8405614 + ... + 8405864.

Almost surely, 2^2109840489 is an apocalyptic number.

2109840489 is the 45933-rd square number.

2109840489 is the 22967-th centered octagonal number.

It is an amenable number.

2109840489 is a deficient number, since it is larger than the sum of its proper divisors (1000878798).

2109840489 is an frugal number, since it uses more digits than its factorization.

2109840489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The cubic root of 2109840489 is about 1282.5762908460.

The spelling of 2109840489 in words is "two billion, one hundred nine million, eight hundred forty thousand, four hundred eighty-nine".