988989889 has 4 divisors (see below), whose sum is σ = 1005202900. Its totient is φ = 972776880.

The previous prime is 988989803. The next prime is 988989901.

It is a happy number.

988989889 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46991025 + 941998864 = 6855^2 + 30692^2 .

It is a cyclic number.

It is not a de Polignac number, because 988989889 - 2¹⁷ = 988858817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988989289) 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, 8106414 + ... + 8106535.

It is an arithmetic number, because the mean of its divisors is an integer number (251300725).

Almost surely, 2^988989889 is an apocalyptic number.

It is an amenable number.

988989889 is a deficient number, since it is larger than the sum of its proper divisors (16213011).

988989889 is a wasteful number, since it uses less digits than its factorization.

988989889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16213010.

The product of its digits is 214990848, while the sum is 76.

The square root of 988989889 is about 31448.2096310744. The cubic root of 988989889 is about 996.3164108315.

The spelling of 988989889 in words is "nine hundred eighty-eight million, nine hundred eighty-nine thousand, eight hundred eighty-nine".