9818212920 has 128 divisors (see below), whose sum is σ = 29785190400. Its totient is φ = 2588923904.

The previous prime is 9818212913. The next prime is 9818212939. The reversal of 9818212920 is 292128189.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11376409 + ... + 11377271.

It is an arithmetic number, because the mean of its divisors is an integer number (232696800).

Almost surely, 2^9818212920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9818212920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14892595200).

9818212920 is an abundant number, since it is smaller than the sum of its proper divisors (19966977480).

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

9818212920 is a wasteful number, since it uses less digits than its factorization.

9818212920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 9818212920 is about 99086.8958036329. The cubic root of 9818212920 is about 2141.2998275601.

The spelling of 9818212920 in words is "nine billion, eight hundred eighteen million, two hundred twelve thousand, nine hundred twenty".