998518 has 8 divisors (see below), whose sum is σ = 1513512. Its totient is φ = 494016.

The previous prime is 998513. The next prime is 998527. The reversal of 998518 is 815899.

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

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998513) 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, 2380 + ... + 2767.

It is an arithmetic number, because the mean of its divisors is an integer number (189189).

2⁹⁹⁸⁵¹⁸ is an apocalyptic number.

998518 is a deficient number, since it is larger than the sum of its proper divisors (514994).

998518 is a wasteful number, since it uses less digits than its factorization.

998518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246.

The product of its digits is 25920, while the sum is 40.

The square root of 998518 is about 999.2587252559. The cubic root of 998518 is about 99.9505755763.

The spelling of 998518 in words is "nine hundred ninety-eight thousand, five hundred eighteen".