9865979900 has 72 divisors (see below), whose sum is σ = 25755434880. Its totient is φ = 3204584640.

The previous prime is 9865979897. The next prime is 9865979911. The reversal of 9865979900 is 99795689.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 357602 + ... + 384201.

Almost surely, 2^9865979900 is an apocalyptic number.

It is an amenable number.

9865979900 is an abundant number, since it is smaller than the sum of its proper divisors (15889454980).

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

9865979900 is a wasteful number, since it uses less digits than its factorization.

9865979900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741843 (or 741836 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 62.

The square root of 9865979900 is about 99327.6391544670. The cubic root of 9865979900 is about 2144.7667856633.

The spelling of 9865979900 in words is "nine billion, eight hundred sixty-five million, nine hundred seventy-nine thousand, nine hundred".