7989449897 has 32 divisors (see below), whose sum is σ = 10461467520.
Its totient is φ = 5977912320.
The previous prime is 7989449869. The next prime is 7989449987.
7989449897 is nontrivially palindromic in base 10.
It is a cyclic number.
It is not a de Polignac number, because 7989449897 - 232 = 3694482601 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (7989449827) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40298 + ... + 132675.
It is an arithmetic number, because the mean of its divisors is an integer number (326920860).
Almost surely, 27989449897 is an apocalyptic number.
It is an amenable number.
7989449897 is a deficient number, since it is larger than the sum of its proper divisors (2472017623).
7989449897 is a wasteful number, since it uses less digits than its factorization.
7989449897 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 173033.
The product of its digits is 329204736, while the sum is 74.
The square root of 7989449897 is about 89383.7227743396.
The cubic root of 7989449897 is about 1999.1204379920.
The spelling of 7989449897 in words is "seven billion, nine hundred eighty-nine million, four hundred forty-nine thousand, eight hundred ninety-seven".