9977898989 has 8 divisors (see below), whose sum is σ = 10005182208. Its totient is φ = 9950640480.

The previous prime is 9977898977. The next prime is 9977899003. The reversal of 9977898989 is 9898987799.

9977898989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 9977898989 - 2²⁰ = 9976850413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9977898289) 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, 1031204 + ... + 1040834.

It is an arithmetic number, because the mean of its divisors is an integer number (1250647776).

Almost surely, 2^9977898989 is an apocalyptic number.

It is an amenable number.

9977898989 is a deficient number, since it is larger than the sum of its proper divisors (27283219).

9977898989 is a wasteful number, since it uses less digits than its factorization.

9977898989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12355.

The product of its digits is 1481421312, while the sum is 83.

The square root of 9977898989 is about 99889.4338205999. The cubic root of 9977898989 is about 2152.8463464972.

The spelling of 9977898989 in words is "nine billion, nine hundred seventy-seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".