998686 has 16 divisors (see below), whose sum is σ = 1639008. Its totient is φ = 453600.

The previous prime is 998681. The next prime is 998687. The reversal of 998686 is 686899.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998681) by changing a digit.

998686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1576 + ... + 2116.

It is an arithmetic number, because the mean of its divisors is an integer number (102438).

2⁹⁹⁸⁶⁸⁶ is an apocalyptic number.

998686 is a deficient number, since it is larger than the sum of its proper divisors (640322).

998686 is a wasteful number, since it uses less digits than its factorization.

998686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627.

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

The square root of 998686 is about 999.3427840336. The cubic root of 998686 is about 99.9561808016.

The spelling of 998686 in words is "nine hundred ninety-eight thousand, six hundred eighty-six".