9807138908 has 72 divisors (see below), whose sum is σ = 21377079360. Its totient is φ = 3911255040.

The previous prime is 9807138899. The next prime is 9807138941. The reversal of 9807138908 is 8098317089.

It is a self number, because there is not a number n which added to its sum of digits gives 9807138908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280013 + ... + 313083.

It is an arithmetic number, because the mean of its divisors is an integer number (296903880).

Almost surely, 2^9807138908 is an apocalyptic number.

9807138908 is a gapful number since it is divisible by the number (98) 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 9807138908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10688539680).

9807138908 is an abundant number, since it is smaller than the sum of its proper divisors (11569940452).

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

9807138908 is a wasteful number, since it uses less digits than its factorization.

9807138908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33195 (or 33186 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 9807138908 is about 99030.9997324070. Note that the first 3 decimals coincide. The cubic root of 9807138908 is about 2140.4944637250.

Adding to 9807138908 its sum of digits (53), we get a square (9807138961 = 99031²).

The spelling of 9807138908 in words is "nine billion, eight hundred seven million, one hundred thirty-eight thousand, nine hundred eight".