1199009900 has 144 divisors (see below), whose sum is σ = 2929312512. Its totient is φ = 422304000.

The previous prime is 1199009789. The next prime is 1199009923. The reversal of 1199009900 is 99009911.

It is a happy number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 10.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 7179617 + ... + 7179783.

It is an arithmetic number, because the mean of its divisors is an integer number (20342448).

Almost surely, 2^1199009900 is an apocalyptic number.

1199009900 is a gapful number since it is divisible by the number (10) 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 1199009900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1464656256).

1199009900 is an abundant number, since it is smaller than the sum of its proper divisors (1730302612).

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

1199009900 is a wasteful number, since it uses less digits than its factorization.

1199009900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 1199009900 is about 34626.7223398346. The cubic root of 1199009900 is about 1062.3662281411.

The spelling of 1199009900 in words is "one billion, one hundred ninety-nine million, nine thousand, nine hundred".