9998399 has 16 divisors (see below), whose sum is σ = 11089920. Its totient is φ = 8981280.

The previous prime is 9998393. The next prime is 9998413. The reversal of 9998399 is 9938999.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 9998399 - 2⁸ = 9998143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26192 + ... + 26570.

It is an arithmetic number, because the mean of its divisors is an integer number (693120).

Almost surely, 2^9998399 is an apocalyptic number.

9998399 is a deficient number, since it is larger than the sum of its proper divisors (1091521).

9998399 is a wasteful number, since it uses less digits than its factorization.

9998399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470.

The product of its digits is 1417176, while the sum is 56.

The square root of 9998399 is about 3162.0245097089. The cubic root of 9998399 is about 215.4319708898.

The spelling of 9998399 in words is "nine million, nine hundred ninety-eight thousand, three hundred ninety-nine".