789989987 has 4 divisors (see below), whose sum is σ = 793064136. Its totient is φ = 786915840.

The previous prime is 789989909. The next prime is 789990007.

789989987 is nontrivially palindromic in base 10.

789989987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 789989987 - 2¹⁶ = 789924451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (789989287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536689 + ... + 1537202.

It is an arithmetic number, because the mean of its divisors is an integer number (198266034).

Almost surely, 2^789989987 is an apocalyptic number.

789989987 is a deficient number, since it is larger than the sum of its proper divisors (3074149).

789989987 is a wasteful number, since it uses less digits than its factorization.

789989987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074148.

The product of its digits is 164602368, while the sum is 74.

The square root of 789989987 is about 28106.7605212696. The cubic root of 789989987 is about 924.4296408869.

The spelling of 789989987 in words is "seven hundred eighty-nine million, nine hundred eighty-nine thousand, nine hundred eighty-seven".