9898987823 has 2 divisors, whose sum is σ = 9898987824. Its totient is φ = 9898987822.

The previous prime is 9898987811. The next prime is 9898987841. The reversal of 9898987823 is 3287898989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9898987823 - 2¹⁶ = 9898922287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9898987853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949493911 + 4949493912.

It is an arithmetic number, because the mean of its divisors is an integer number (4949493912).

Almost surely, 2^9898987823 is an apocalyptic number.

9898987823 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898987823 is an equidigital number, since it uses as much as digits as its factorization.

9898987823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125411328, while the sum is 71.

The square root of 9898987823 is about 99493.6571998436. The cubic root of 9898987823 is about 2147.1559888825.

The spelling of 9898987823 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred twenty-three".