987898989 has 32 divisors (see below), whose sum is σ = 1643811840. Its totient is φ = 512697600.

The previous prime is 987898981. The next prime is 987898991. The reversal of 987898989 is 989898789.

987898989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

987898989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 987898989 - 2³ = 987898981 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 987898989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987898981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456069 + ... + 458229.

It is an arithmetic number, because the mean of its divisors is an integer number (51369120).

Almost surely, 2^987898989 is an apocalyptic number.

It is an amenable number.

987898989 is a deficient number, since it is larger than the sum of its proper divisors (655912851).

987898989 is a wasteful number, since it uses less digits than its factorization.

987898989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161.

The product of its digits is 188116992, while the sum is 75.

The square root of 987898989 is about 31430.8604559277. The cubic root of 987898989 is about 995.9499488969.

The spelling of 987898989 in words is "nine hundred eighty-seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".