988009 has 4 divisors (see below), whose sum is σ = 1077840. Its totient is φ = 898180.

The previous prime is 988007. The next prime is 988021. The reversal of 988009 is 900889.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900889 = 11 ⋅81899.

It is a cyclic number.

It is not a de Polignac number, because 988009 - 2¹ = 988007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44899 + ... + 44920.

It is an arithmetic number, because the mean of its divisors is an integer number (269460).

2⁹⁸⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

988009 is a deficient number, since it is larger than the sum of its proper divisors (89831).

988009 is a wasteful number, since it uses less digits than its factorization.

988009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89830.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 988009 is about 993.9864184183. The cubic root of 988009 is about 99.5986916706.

The spelling of 988009 in words is "nine hundred eighty-eight thousand, nine".