9899779989 has 8 divisors (see below), whose sum is σ = 14399680032. Its totient is φ = 5999866640.

The previous prime is 9899779961. The next prime is 9899780003.

9899779989 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9899779989 - 2⁵ = 9899779957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899777989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149996634 + ... + 149996699.

It is an arithmetic number, because the mean of its divisors is an integer number (1799960004).

Almost surely, 2^9899779989 is an apocalyptic number.

It is an amenable number.

9899779989 is a deficient number, since it is larger than the sum of its proper divisors (4499900043).

9899779989 is a wasteful number, since it uses less digits than its factorization.

9899779989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299993347.

The product of its digits is 1666598976, while the sum is 84.

The square root of 9899779989 is about 99497.6381076456. The cubic root of 9899779989 is about 2147.2132627046.

The spelling of 9899779989 in words is "nine billion, eight hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred eighty-nine".