2109798918 has 12 divisors (see below), whose sum is σ = 4571231028. Its totient is φ = 703266300.

The previous prime is 2109798907. The next prime is 2109798919. The reversal of 2109798918 is 8198979012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109798919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58605508 + ... + 58605543.

It is an arithmetic number, because the mean of its divisors is an integer number (380935919).

Almost surely, 2^2109798918 is an apocalyptic number.

2109798918 is an abundant number, since it is smaller than the sum of its proper divisors (2461432110).

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

2109798918 is a wasteful number, since it uses less digits than its factorization.

2109798918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117211059 (or 117211056 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 2109798918 is about 45932.5474799733. The cubic root of 2109798918 is about 1282.5678670924.

The spelling of 2109798918 in words is "two billion, one hundred nine million, seven hundred ninety-eight thousand, nine hundred eighteen".