9899889934 has 16 divisors (see below), whose sum is σ = 16269355440. Its totient is φ = 4480634560.

The previous prime is 9899889929. The next prime is 9899890001. The reversal of 9899889934 is 4399889989.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 960529 + ... + 970780.

It is an arithmetic number, because the mean of its divisors is an integer number (1016834715).

Almost surely, 2^9899889934 is an apocalyptic number.

9899889934 is a deficient number, since it is larger than the sum of its proper divisors (6369465506).

9899889934 is a wasteful number, since it uses less digits than its factorization.

9899889934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931555.

The product of its digits is 362797056, while the sum is 76.

The square root of 9899889934 is about 99498.1906066638. The cubic root of 9899889934 is about 2147.2212115172.

Subtracting from 9899889934 its reverse (4399889989), we obtain a palindrome (5499999945).

The spelling of 9899889934 in words is "nine billion, eight hundred ninety-nine million, eight hundred eighty-nine thousand, nine hundred thirty-four".