9999997823 has 2 divisors, whose sum is σ = 9999997824. Its totient is φ = 9999997822.

The previous prime is 9999997811. The next prime is 9999997859. The reversal of 9999997823 is 3287999999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9999997823 - 2¹⁸ = 9999735679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999993823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999998911 + 4999998912.

It is an arithmetic number, because the mean of its divisors is an integer number (4999998912).

Almost surely, 2^9999997823 is an apocalyptic number.

9999997823 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999997823 is an equidigital number, since it uses as much as digits as its factorization.

9999997823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 178564176, while the sum is 74.

The square root of 9999997823 is about 99999.9891149994. The cubic root of 9999997823 is about 2154.4345336917.

It can be divided in two parts, 99999978 and 23, that added together give a palindrome (100000001).

The spelling of 9999997823 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, eight hundred twenty-three".