989859988 has 18 divisors (see below), whose sum is σ = 1865933034. Its totient is φ = 456753744.

The previous prime is 989859961. The next prime is 989860031. The reversal of 989859988 is 889958989.

It can be written as a sum of positive squares in only one way, i.e., 685287684 + 304572304 = 26178^2 + 17452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 989859988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224695 + ... + 229057.

Almost surely, 2^989859988 is an apocalyptic number.

It is an amenable number.

989859988 is a deficient number, since it is larger than the sum of its proper divisors (876073046).

989859988 is an equidigital number, since it uses as much as digits as its factorization.

989859988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743 (or 4378 counting only the distinct ones).

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

The square root of 989859988 is about 31462.0404296988. The cubic root of 989859988 is about 996.6085067770.

Subtracting from 989859988 its reverse (889958989), we obtain a palindrome (99900999).

The spelling of 989859988 in words is "nine hundred eighty-nine million, eight hundred fifty-nine thousand, nine hundred eighty-eight".