1099985800 has 24 divisors (see below), whose sum is σ = 2557467450. Its totient is φ = 439994240.

The previous prime is 1099985773. The next prime is 1099985819. The reversal of 1099985800 is 85899901.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 693479556 + 406506244 = 26334^2 + 20162^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2749765 + ... + 2750164.

Almost surely, 2^1099985800 is an apocalyptic number.

1099985800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099985800 is an abundant number, since it is smaller than the sum of its proper divisors (1457481650).

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

1099985800 is a wasteful number, since it uses less digits than its factorization.

1099985800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499945 (or 5499936 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 1099985800 is about 33166.0338298085. The cubic root of 1099985800 is about 1032.2756735046.

The spelling of 1099985800 in words is "one billion, ninety-nine million, nine hundred eighty-five thousand, eight hundred".