9897937920 has 792 divisors, whose sum is σ = 39270172032. Its totient is φ = 2300313600.

The previous prime is 9897937891. The next prime is 9897937963. The reversal of 9897937920 is 297397989.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 241413100 + ... + 241413140.

Almost surely, 2^9897937920 is an apocalyptic number.

9897937920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9897937920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19635086016).

9897937920 is an abundant number, since it is smaller than the sum of its proper divisors (29372234112).

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

9897937920 is a wasteful number, since it uses less digits than its factorization.

9897937920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 63.

The square root of 9897937920 is about 99488.3808291199. The cubic root of 9897937920 is about 2147.0800758950.

The spelling of 9897937920 in words is "nine billion, eight hundred ninety-seven million, nine hundred thirty-seven thousand, nine hundred twenty".