987842789 has 8 divisors (see below), whose sum is σ = 1002734040. Its totient is φ = 972988416.

The previous prime is 987842777. The next prime is 987842797. The reversal of 987842789 is 987248789.

987842789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3452164 + 984390625 = 1858^2 + 31375^2 .

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 987842789 - 2⁸ = 987842533 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 (987842729) 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, 47339 + ... + 64935.

It is an arithmetic number, because the mean of its divisors is an integer number (125341755).

Almost surely, 2^987842789 is an apocalyptic number.

It is an amenable number.

987842789 is a deficient number, since it is larger than the sum of its proper divisors (14891251).

987842789 is a wasteful number, since it uses less digits than its factorization.

987842789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18439.

The product of its digits is 16257024, while the sum is 62.

The square root of 987842789 is about 31429.9664174176. The cubic root of 987842789 is about 995.9310625367.

The spelling of 987842789 in words is "nine hundred eighty-seven million, eight hundred forty-two thousand, seven hundred eighty-nine".