998668 has 12 divisors (see below), whose sum is σ = 1906632. Its totient is φ = 453920.

The previous prime is 998653. The next prime is 998681. The reversal of 998668 is 866899.

It is a happy 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, 11305 + ... + 11392.

It is an arithmetic number, because the mean of its divisors is an integer number (158886).

2⁹⁹⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

998668 is a deficient number, since it is larger than the sum of its proper divisors (907964).

998668 is a wasteful number, since it uses less digits than its factorization.

998668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22712 (or 22710 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 998668 is about 999.3337780742. Note that the first 3 decimals coincide. The cubic root of 998668 is about 99.9555802718.

Subtracting from 998668 its reverse (866899), we obtain a square (131769 = 363²).

The spelling of 998668 in words is "nine hundred ninety-eight thousand, six hundred sixty-eight".