989998 has 8 divisors (see below), whose sum is σ = 1491192. Its totient is φ = 492936.

The previous prime is 989981. The next prime is 989999. The reversal of 989998 is 899989.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989999) by changing a digit.

989998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340 + ... + 1447.

It is an arithmetic number, because the mean of its divisors is an integer number (186399).

2⁹⁸⁹⁹⁹⁸ is an apocalyptic number.

989998 is a deficient number, since it is larger than the sum of its proper divisors (501194).

989998 is a wasteful number, since it uses less digits than its factorization.

989998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066.

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

The square root of 989998 is about 994.9864320683. The cubic root of 989998 is about 99.6654822264.

Subtracting from 989998 its reverse (899989), we obtain a palindrome (90009).

The spelling of 989998 in words is "nine hundred eighty-nine thousand, nine hundred ninety-eight".