999969823 has 2 divisors, whose sum is σ = 999969824. Its totient is φ = 999969822.

The previous prime is 999969797. The next prime is 999969847. The reversal of 999969823 is 328969999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999969823 - 2¹³ = 999961631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999969853) 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, 499984911 + 499984912.

It is an arithmetic number, because the mean of its divisors is an integer number (499984912).

Almost surely, 2^999969823 is an apocalyptic number.

999969823 is a deficient number, since it is larger than the sum of its proper divisors (1).

999969823 is an equidigital number, since it uses as much as digits as its factorization.

999969823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17006112, while the sum is 64.

The square root of 999969823 is about 31622.2994578193. The cubic root of 999969823 is about 999.9899408988.

The spelling of 999969823 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, eight hundred twenty-three".