998558989 has 8 divisors (see below), whose sum is σ = 1012435200. Its totient is φ = 984767136.

The previous prime is 998558933. The next prime is 998558993. The reversal of 998558989 is 989855899.

It is a happy number.

998558989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 998558989 - 2⁷ = 998558861 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 (998558999) 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, 2937 + ... + 44785.

It is an arithmetic number, because the mean of its divisors is an integer number (126554400).

Almost surely, 2^998558989 is an apocalyptic number.

It is an amenable number.

998558989 is a deficient number, since it is larger than the sum of its proper divisors (13876211).

998558989 is a wasteful number, since it uses less digits than its factorization.

998558989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42179.

The product of its digits is 83980800, while the sum is 70.

The square root of 998558989 is about 31599.9840031605. The cubic root of 998558989 is about 999.5194320915.

The spelling of 998558989 in words is "nine hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred eighty-nine".