998819 has 2 divisors, whose sum is σ = 998820. Its totient is φ = 998818.

The previous prime is 998813. The next prime is 998831. The reversal of 998819 is 918899.

It is a weak prime.

It is an emirp because it is prime and its reverse (918899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998819 - 2¹² = 994723 is a prime.

It is a super-2 number, since 2×998819² = 1995278789522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998819.

It is not a weakly prime, because it can be changed into another prime (998813) 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 as a sum of consecutive naturals, namely, 499409 + 499410.

It is an arithmetic number, because the mean of its divisors is an integer number (499410).

2⁹⁹⁸⁸¹⁹ is an apocalyptic number.

998819 is a deficient number, since it is larger than the sum of its proper divisors (1).

998819 is an equidigital number, since it uses as much as digits as its factorization.

998819 is an odious number, because the sum of its binary digits is odd.

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

The square root of 998819 is about 999.4093255518. The cubic root of 998819 is about 99.9606178258.

The spelling of 998819 in words is "nine hundred ninety-eight thousand, eight hundred nineteen".