2099861800 has 24 divisors (see below), whose sum is σ = 4882179150. Its totient is φ = 839944640.

The previous prime is 2099861773. The next prime is 2099861821. The reversal of 2099861800 is 81689902.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1923875044 + 175986756 = 43862^2 + 13266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5249455 + ... + 5249854.

Almost surely, 2^2099861800 is an apocalyptic number.

2099861800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2099861800 is an abundant number, since it is smaller than the sum of its proper divisors (2782317350).

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

2099861800 is a wasteful number, since it uses less digits than its factorization.

2099861800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10499325 (or 10499316 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 2099861800 is about 45824.2490391277. The cubic root of 2099861800 is about 1280.5510729362.

The spelling of 2099861800 in words is "two billion, ninety-nine million, eight hundred sixty-one thousand, eight hundred".