9821889380 has 24 divisors (see below), whose sum is σ = 20964100920. Its totient is φ = 3864349440.

The previous prime is 9821889379. The next prime is 9821889421. The reversal of 9821889380 is 839881289.

It can be written as a sum of positive squares in 4 ways, for example, as 607425316 + 9214464064 = 24646^2 + 95992^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4024145 + ... + 4026584.

It is an arithmetic number, because the mean of its divisors is an integer number (873504205).

Almost surely, 2^9821889380 is an apocalyptic number.

It is an amenable number.

9821889380 is an abundant number, since it is smaller than the sum of its proper divisors (11142211540).

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

9821889380 is a wasteful number, since it uses less digits than its factorization.

9821889380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050799 (or 8050797 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 56.

The square root of 9821889380 is about 99105.4457635906. The cubic root of 9821889380 is about 2141.5670663070.

The spelling of 9821889380 in words is "nine billion, eight hundred twenty-one million, eight hundred eighty-nine thousand, three hundred eighty".