989983 has 4 divisors (see below), whose sum is σ = 992128. Its totient is φ = 987840.

The previous prime is 989981. The next prime is 989999. The reversal of 989983 is 389989.

989983 is nontrivially palindromic in base 16.

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 989983 - 2¹ = 989981 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 (989981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (248032).

2⁹⁸⁹⁹⁸³ is an apocalyptic number.

989983 is a deficient number, since it is larger than the sum of its proper divisors (2145).

989983 is a wasteful number, since it uses less digits than its factorization.

989983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144.

The product of its digits is 139968, while the sum is 46.

The square root of 989983 is about 994.9788942485. The cubic root of 989983 is about 99.6649788618.

The spelling of 989983 in words is "nine hundred eighty-nine thousand, nine hundred eighty-three".