998939899 has 2 divisors, whose sum is σ = 998939900. Its totient is φ = 998939898.

The previous prime is 998939881. The next prime is 998939969.

It is a happy number.

998939899 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 998939899 - 2⁹ = 998939387 is a prime.

It is not a weakly prime, because it can be changed into another prime (998939819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499469949 + 499469950.

It is an arithmetic number, because the mean of its divisors is an integer number (499469950).

Almost surely, 2^998939899 is an apocalyptic number.

998939899 is a deficient number, since it is larger than the sum of its proper divisors (1).

998939899 is an equidigital number, since it uses as much as digits as its factorization.

998939899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102036672, while the sum is 73.

The square root of 998939899 is about 31606.0104885131. The cubic root of 998939899 is about 999.6465080582.

The spelling of 998939899 in words is "nine hundred ninety-eight million, nine hundred thirty-nine thousand, eight hundred ninety-nine".