998992 has 20 divisors (see below), whose sum is σ = 2003220. Its totient is φ = 482048.

The previous prime is 998989. The next prime is 999007. The reversal of 998992 is 299899.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 732736 = 516^2 + 856^2 .

It is a pancake number, because a pancake can be divided into 998992 parts by 1413 straight cuts.

It is a congruent number.

It is an unprimeable number.

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, 613 + ... + 1540.

It is an arithmetic number, because the mean of its divisors is an integer number (100161).

2⁹⁹⁸⁹⁹² is an apocalyptic number.

It is an amenable number.

998992 is an abundant number, since it is smaller than the sum of its proper divisors (1004228).

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

998992 is a wasteful number, since it uses less digits than its factorization.

998992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 2184 counting only the distinct ones).

The product of its digits is 104976, while the sum is 46.

The square root of 998992 is about 999.4958729279. The cubic root of 998992 is about 99.9663887041.

The spelling of 998992 in words is "nine hundred ninety-eight thousand, nine hundred ninety-two".