999728423 has 2 divisors, whose sum is σ = 999728424. Its totient is φ = 999728422.

The previous prime is 999728417. The next prime is 999728437. The reversal of 999728423 is 324827999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999728423 - 2²⁶ = 932619559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999728413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499864211 + 499864212.

It is an arithmetic number, because the mean of its divisors is an integer number (499864212).

Almost surely, 2^999728423 is an apocalyptic number.

999728423 is a deficient number, since it is larger than the sum of its proper divisors (1).

999728423 is an equidigital number, since it uses as much as digits as its factorization.

999728423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The square root of 999728423 is about 31618.4823007051. The cubic root of 999728423 is about 999.9094661372.

The spelling of 999728423 in words is "nine hundred ninety-nine million, seven hundred twenty-eight thousand, four hundred twenty-three".