1000209988 has 12 divisors (see below), whose sum is σ = 1750598892. Its totient is φ = 500038880.

The previous prime is 1000209983. The next prime is 1000210037. The reversal of 1000209988 is 8899020001.

It can be written as a sum of positive squares in 2 ways, for example, as 498539584 + 501670404 = 22328^2 + 22398^2 .

It is not an unprimeable number, because it can be changed into a prime (1000209983) 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 3 ways as a sum of consecutive naturals, for example, 36198 + ... + 57538.

It is an arithmetic number, because the mean of its divisors is an integer number (145883241).

Almost surely, 2^1000209988 is an apocalyptic number.

It is an amenable number.

1000209988 is a deficient number, since it is larger than the sum of its proper divisors (750388904).

1000209988 is a wasteful number, since it uses less digits than its factorization.

1000209988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33062 (or 33060 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1000209988 is about 31626.0966292080. The cubic root of 1000209988 is about 1000.0699911011.

Adding to 1000209988 its reverse (8899020001), we get a palindrome (9899229989).

The spelling of 1000209988 in words is "one billion, two hundred nine thousand, nine hundred eighty-eight".