999800687 has 2 divisors, whose sum is σ = 999800688. Its totient is φ = 999800686.

The previous prime is 999800597. The next prime is 999800699. The reversal of 999800687 is 786008999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999800687 - 2¹⁸ = 999538543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999800587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499900343 + 499900344.

It is an arithmetic number, because the mean of its divisors is an integer number (499900344).

Almost surely, 2^999800687 is an apocalyptic number.

999800687 is a deficient number, since it is larger than the sum of its proper divisors (1).

999800687 is an equidigital number, since it uses as much as digits as its factorization.

999800687 is an odious number, because the sum of its binary digits is odd.

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

The square root of 999800687 is about 31619.6250294022. The cubic root of 999800687 is about 999.9335579189.

The spelling of 999800687 in words is "nine hundred ninety-nine million, eight hundred thousand, six hundred eighty-seven".