998918 has 4 divisors (see below), whose sum is σ = 1498380. Its totient is φ = 499458.

The previous prime is 998917. The next prime is 998927. The reversal of 998918 is 819899.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998917) by changing a digit.

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 as a sum of consecutive naturals, namely, 249728 + ... + 249731.

It is an arithmetic number, because the mean of its divisors is an integer number (374595).

2⁹⁹⁸⁹¹⁸ is an apocalyptic number.

998918 is a deficient number, since it is larger than the sum of its proper divisors (499462).

998918 is a wasteful number, since it uses less digits than its factorization.

998918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499461.

The product of its digits is 46656, while the sum is 44.

The square root of 998918 is about 999.4588535803. The cubic root of 998918 is about 99.9639203175.

It can be divided in two parts, 99891 and 8, that added together give a palindrome (99899).

The spelling of 998918 in words is "nine hundred ninety-eight thousand, nine hundred eighteen".