998943817 has 6 divisors (see below), whose sum is σ = 1061162078. Its totient is φ = 940182144.

The previous prime is 998943779. The next prime is 998943821. The reversal of 998943817 is 718349899.

It is a happy number.

998943817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 345067776 + 653876041 = 18576^2 + 25571^2 .

It is not a de Polignac number, because 998943817 - 2¹⁹ = 998419529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998943877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1727988 + ... + 1728565.

Almost surely, 2^998943817 is an apocalyptic number.

It is an amenable number.

998943817 is a deficient number, since it is larger than the sum of its proper divisors (62218261).

998943817 is a wasteful number, since it uses less digits than its factorization.

998943817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456587 (or 3456570 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 58.

The square root of 998943817 is about 31606.0724703339. The cubic root of 998943817 is about 999.6478149803.

The spelling of 998943817 in words is "nine hundred ninety-eight million, nine hundred forty-three thousand, eight hundred seventeen".