998579 has 4 divisors (see below), whose sum is σ = 1000776. Its totient is φ = 996384.

The previous prime is 998561. The next prime is 998617. The reversal of 998579 is 975899.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998579 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998579.

It is not an unprimeable number, because it can be changed into a prime (998539) 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, 134 + ... + 1419.

It is an arithmetic number, because the mean of its divisors is an integer number (250194).

2⁹⁹⁸⁵⁷⁹ is an apocalyptic number.

998579 is a deficient number, since it is larger than the sum of its proper divisors (2197).

998579 is a wasteful number, since it uses less digits than its factorization.

998579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196.

The product of its digits is 204120, while the sum is 47.

The square root of 998579 is about 999.2892474154. The cubic root of 998579 is about 99.9526108796.

The spelling of 998579 in words is "nine hundred ninety-eight thousand, five hundred seventy-nine".