998843869 has 2 divisors, whose sum is σ = 998843870. Its totient is φ = 998843868.

The previous prime is 998843831. The next prime is 998843887. The reversal of 998843869 is 968348899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523036900 + 475806969 = 22870^2 + 21813^2 .

It is a cyclic number.

It is not a de Polignac number, because 998843869 - 2¹¹ = 998841821 is a prime.

It is a super-2 number, since 2×998843869² = 1995378149277778322, 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 998843869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998843569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499421934 + 499421935.

It is an arithmetic number, because the mean of its divisors is an integer number (499421935).

Almost surely, 2^998843869 is an apocalyptic number.

It is an amenable number.

998843869 is a deficient number, since it is larger than the sum of its proper divisors (1).

998843869 is an equidigital number, since it uses as much as digits as its factorization.

998843869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 64.

The square root of 998843869 is about 31604.4912789306. The cubic root of 998843869 is about 999.6144743891.

The spelling of 998843869 in words is "nine hundred ninety-eight million, eight hundred forty-three thousand, eight hundred sixty-nine".