998884409 has 2 divisors, whose sum is σ = 998884410. Its totient is φ = 998884408.

The previous prime is 998884391. The next prime is 998884427. The reversal of 998884409 is 904488899.

998884409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (998884391) and next prime (998884427).

It can be written as a sum of positive squares in only one way, i.e., 528862009 + 470022400 = 22997^2 + 21680^2 .

It is a cyclic number.

It is not a de Polignac number, because 998884409 - 2¹² = 998880313 is a prime.

It is not a weakly prime, because it can be changed into another prime (998884309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499442204 + 499442205.

It is an arithmetic number, because the mean of its divisors is an integer number (499442205).

Almost surely, 2^998884409 is an apocalyptic number.

It is an amenable number.

998884409 is a deficient number, since it is larger than the sum of its proper divisors (1).

998884409 is an equidigital number, since it uses as much as digits as its factorization.

998884409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The square root of 998884409 is about 31605.1326369626. The cubic root of 998884409 is about 999.6279979650.

The spelling of 998884409 in words is "nine hundred ninety-eight million, eight hundred eighty-four thousand, four hundred nine".