998858 has 8 divisors (see below), whose sum is σ = 1712352. Its totient is φ = 428076.

The previous prime is 998857. The next prime is 998861. The reversal of 998858 is 858899.

It is a happy number.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998858.

It is not an unprimeable number, because it can be changed into a prime (998857) by changing a digit.

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, 35660 + ... + 35687.

It is an arithmetic number, because the mean of its divisors is an integer number (214044).

2⁹⁹⁸⁸⁵⁸ is an apocalyptic number.

998858 is a deficient number, since it is larger than the sum of its proper divisors (713494).

998858 is a wasteful number, since it uses less digits than its factorization.

998858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71356.

The product of its digits is 207360, while the sum is 47.

The square root of 998858 is about 999.4288368863. The cubic root of 998858 is about 99.9619188334.

The spelling of 998858 in words is "nine hundred ninety-eight thousand, eight hundred fifty-eight".