999813827 has 2 divisors, whose sum is σ = 999813828. Its totient is φ = 999813826.

The previous prime is 999813799. The next prime is 999813833. The reversal of 999813827 is 728318999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999813827 - 2¹⁴ = 999797443 is a prime.

It is not a weakly prime, because it can be changed into another prime (999813127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499906913 + 499906914.

It is an arithmetic number, because the mean of its divisors is an integer number (499906914).

Almost surely, 2^999813827 is an apocalyptic number.

999813827 is a deficient number, since it is larger than the sum of its proper divisors (1).

999813827 is an equidigital number, since it uses as much as digits as its factorization.

999813827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 56.

The square root of 999813827 is about 31619.8328110697. The cubic root of 999813827 is about 999.9379384818.

The spelling of 999813827 in words is "nine hundred ninety-nine million, eight hundred thirteen thousand, eight hundred twenty-seven".