998589 has 8 divisors (see below), whose sum is σ = 1362592. Its totient is φ = 650160.

The previous prime is 998561. The next prime is 998617. The reversal of 998589 is 985899.

It is an interprime number because it is at equal distance from previous prime (998561) and next prime (998617).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 998589 - 2⁹ = 998077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3742 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (170324).

2⁹⁹⁸⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

998589 is a deficient number, since it is larger than the sum of its proper divisors (364003).

998589 is a wasteful number, since it uses less digits than its factorization.

998589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787.

The product of its digits is 233280, while the sum is 48.

The square root of 998589 is about 999.2942509591. The cubic root of 998589 is about 99.9529445280.

The spelling of 998589 in words is "nine hundred ninety-eight thousand, five hundred eighty-nine".