999853 has 2 divisors, whose sum is σ = 999854. Its totient is φ = 999852.

The previous prime is 999809. The next prime is 999863. The reversal of 999853 is 358999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850084 + 149769 = 922^2 + 387^2 .

It is an emirp because it is prime and its reverse (358999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999853 is a prime.

It is an Ulam number.

999853 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499926 + 499927.

It is an arithmetic number, because the mean of its divisors is an integer number (499927).

2⁹⁹⁹⁸⁵³ is an apocalyptic number.

It is an amenable number.

999853 is a deficient number, since it is larger than the sum of its proper divisors (1).

999853 is an equidigital number, since it uses as much as digits as its factorization.

999853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 999853 is about 999.9264972987. The cubic root of 999853 is about 99.9950997599.

The spelling of 999853 in words is "nine hundred ninety-nine thousand, eight hundred fifty-three".