999789853 has 2 divisors, whose sum is σ = 999789854. Its totient is φ = 999789852.

The previous prime is 999789821. The next prime is 999789871. The reversal of 999789853 is 358987999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942060249 + 57729604 = 30693^2 + 7598^2 .

It is a cyclic number.

It is not a de Polignac number, because 999789853 - 2⁵ = 999789821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999789353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499894926 + 499894927.

It is an arithmetic number, because the mean of its divisors is an integer number (499894927).

Almost surely, 2^999789853 is an apocalyptic number.

It is an amenable number.

999789853 is a deficient number, since it is larger than the sum of its proper divisors (1).

999789853 is an equidigital number, since it uses as much as digits as its factorization.

999789853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44089920, while the sum is 67.

The square root of 999789853 is about 31619.4537112835. The cubic root of 999789853 is about 999.9299460926.

The spelling of 999789853 in words is "nine hundred ninety-nine million, seven hundred eighty-nine thousand, eight hundred fifty-three".