200109987 has 64 divisors (see below), whose sum is σ = 373662720. Its totient is φ = 102816000.

The previous prime is 200109911. The next prime is 200109997. The reversal of 200109987 is 789901002.

It is a happy number.

It is not a de Polignac number, because 200109987 - 2⁷ = 200109859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (200109997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209503 + ... + 210455.

It is an arithmetic number, because the mean of its divisors is an integer number (5838480).

Almost surely, 2^200109987 is an apocalyptic number.

200109987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

200109987 is a deficient number, since it is larger than the sum of its proper divisors (173552733).

200109987 is a wasteful number, since it uses less digits than its factorization.

200109987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1075 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 200109987 is about 14146.0237169319. The cubic root of 200109987 is about 584.9107293103.

The spelling of 200109987 in words is "two hundred million, one hundred nine thousand, nine hundred eighty-seven".