9971985308 has 18 divisors (see below), whose sum is σ = 18417789936. Its totient is φ = 4723571304.

The previous prime is 9971985301. The next prime is 9971985311. The reversal of 9971985308 is 8035891799.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971985301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3451460 + ... + 3454347.

It is an arithmetic number, because the mean of its divisors is an integer number (1023210552).

Almost surely, 2^9971985308 is an apocalyptic number.

It is an amenable number.

9971985308 is a deficient number, since it is larger than the sum of its proper divisors (8445804628).

9971985308 is a wasteful number, since it uses less digits than its factorization.

9971985308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905849 (or 6905828 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 59.

The square root of 9971985308 is about 99859.8282994719. The cubic root of 9971985308 is about 2152.4209475712.

The spelling of 9971985308 in words is "nine billion, nine hundred seventy-one million, nine hundred eighty-five thousand, three hundred eight".