9987840836 has 12 divisors (see below), whose sum is σ = 17633401212. Its totient is φ = 4949726208.

The previous prime is 9987840829. The next prime is 9987840857. The reversal of 9987840836 is 6380487899.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1390842436 + 8596998400 = 37294^2 + 92720^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11048045 + ... + 11048948.

It is an arithmetic number, because the mean of its divisors is an integer number (1469450101).

Almost surely, 2^9987840836 is an apocalyptic number.

It is an amenable number.

9987840836 is a deficient number, since it is larger than the sum of its proper divisors (7645560376).

9987840836 is a wasteful number, since it uses less digits than its factorization.

9987840836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22097110 (or 22097108 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 62.

The square root of 9987840836 is about 99939.1856880973. The cubic root of 9987840836 is about 2153.5611317208.

The spelling of 9987840836 in words is "nine billion, nine hundred eighty-seven million, eight hundred forty thousand, eight hundred thirty-six".