989858989 has 16 divisors (see below), whose sum is σ = 1153376640. Its totient is φ = 831942720.

The previous prime is 989858971. The next prime is 989858999.

989858989 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 989858989 - 2¹¹ = 989856941 is a prime.

It is a super-3 number, since 3×989858989³ (a number of 28 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989858939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171027 + ... + 176719.

It is an arithmetic number, because the mean of its divisors is an integer number (72086040).

Almost surely, 2^989858989 is an apocalyptic number.

It is an amenable number.

989858989 is a deficient number, since it is larger than the sum of its proper divisors (163517651).

989858989 is a wasteful number, since it uses less digits than its factorization.

989858989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180.

The product of its digits is 134369280, while the sum is 73.

The square root of 989858989 is about 31462.0245534200. The cubic root of 989858989 is about 996.6081715066.

The spelling of 989858989 in words is "nine hundred eighty-nine million, eight hundred fifty-eight thousand, nine hundred eighty-nine".