9999899992 has 16 divisors (see below), whose sum is σ = 18778982040. Its totient is φ = 4992171456.

The previous prime is 9999899971. The next prime is 9999899993. The reversal of 9999899992 is 2999989999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999899993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966853 + ... + 977140.

Almost surely, 2^9999899992 is an apocalyptic number.

It is an amenable number.

9999899992 is a deficient number, since it is larger than the sum of its proper divisors (8779082048).

9999899992 is a wasteful number, since it uses less digits than its factorization.

9999899992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944642 (or 1944638 counting only the distinct ones).

The product of its digits is 688747536, while the sum is 82.

The square root of 9999899992 is about 99999.4999587498. The cubic root of 9999899992 is about 2154.4275079845.

The spelling of 9999899992 in words is "nine billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, nine hundred ninety-two".