998988 has 48 divisors (see below), whose sum is σ = 2540160. Its totient is φ = 304384.

The previous prime is 998983. The next prime is 998989. The reversal of 998988 is 889899.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 998988.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998988.

It is not an unprimeable number, because it can be changed into a prime (998983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11995 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁹⁹⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270080).

998988 is an abundant number, since it is smaller than the sum of its proper divisors (1541172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998988 is a wasteful number, since it uses less digits than its factorization.

998988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 164 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 998988 is about 999.4938719172. The cubic root of 998988 is about 99.9662552809.

The spelling of 998988 in words is "nine hundred ninety-eight thousand, nine hundred eighty-eight".