999999893 has 2 divisors, whose sum is σ = 999999894. Its totient is φ = 999999892.

The previous prime is 999999883. The next prime is 999999929. The reversal of 999999893 is 398999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995907364 + 4092529 = 31558^2 + 2023^2 .

It is an emirp because it is prime and its reverse (398999999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999999893 - 2¹⁰ = 999998869 is a prime.

It is a super-2 number, since 2×999999893² = 1999999572000022898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999999893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999883) 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, 499999946 + 499999947.

It is an arithmetic number, because the mean of its divisors is an integer number (499999947).

Almost surely, 2^999999893 is an apocalyptic number.

It is an amenable number.

999999893 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999893 is an equidigital number, since it uses as much as digits as its factorization.

999999893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114791256, while the sum is 74.

The square root of 999999893 is about 31622.7749098652. The cubic root of 999999893 is about 999.9999643333. Note that the first 4 decimals are identical.

The spelling of 999999893 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-three".