998820799 has 2 divisors, whose sum is σ = 998820800. Its totient is φ = 998820798.

The previous prime is 998820773. The next prime is 998820811. The reversal of 998820799 is 997028899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998820799 - 2¹⁹ = 998296511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998820749) 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, 499410399 + 499410400.

It is an arithmetic number, because the mean of its divisors is an integer number (499410400).

Almost surely, 2^998820799 is an apocalyptic number.

998820799 is a deficient number, since it is larger than the sum of its proper divisors (1).

998820799 is an equidigital number, since it uses as much as digits as its factorization.

998820799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 61.

The square root of 998820799 is about 31604.1262970518. The cubic root of 998820799 is about 999.6067783970.

The spelling of 998820799 in words is "nine hundred ninety-eight million, eight hundred twenty thousand, seven hundred ninety-nine".