989899 has 4 divisors (see below), whose sum is σ = 996136. Its totient is φ = 983664.

The previous prime is 989887. The next prime is 989909. The reversal of 989899 is 998989.

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 989899 - 2¹¹ = 987851 is a prime.

It is a Duffinian number.

989899 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (989839) 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, 2874 + ... + 3199.

It is an arithmetic number, because the mean of its divisors is an integer number (249034).

2⁹⁸⁹⁸⁹⁹ is an apocalyptic number.

989899 is a deficient number, since it is larger than the sum of its proper divisors (6237).

989899 is a wasteful number, since it uses less digits than its factorization.

989899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6236.

The product of its digits is 419904, while the sum is 52.

The square root of 989899 is about 994.9366814024. The cubic root of 989899 is about 99.6621599262.

It can be divided in two parts, 989 and 899, that multiplied together give a triangular number (889111 = T₁₃₃₃).

The spelling of 989899 in words is "nine hundred eighty-nine thousand, eight hundred ninety-nine".