998866 has 8 divisors (see below), whose sum is σ = 1634544. Its totient is φ = 454020.

The previous prime is 998861. The next prime is 998897. The reversal of 998866 is 668899.

It is a happy number.

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

998866 is a strobogrammatic number because it is the same when read upside-down.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (998861) by changing a digit.

998866 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 3 ways as a sum of consecutive naturals, for example, 22680 + ... + 22723.

It is an arithmetic number, because the mean of its divisors is an integer number (204318).

2⁹⁹⁸⁸⁶⁶ is an apocalyptic number.

998866 is a deficient number, since it is larger than the sum of its proper divisors (635678).

998866 is a wasteful number, since it uses less digits than its factorization.

998866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45416.

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

The square root of 998866 is about 999.4328391643. The cubic root of 998866 is about 99.9621857026.

The spelling of 998866 in words is "nine hundred ninety-eight thousand, eight hundred sixty-six".