999798709 has 16 divisors (see below), whose sum is σ = 1232597632. Its totient is φ = 789715008.

The previous prime is 999798673. The next prime is 999798727. The reversal of 999798709 is 907897999.

It is a cyclic number.

It is not a de Polignac number, because 999798709 - 2⁷ = 999798581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999798739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46822 + ... + 64744.

It is an arithmetic number, because the mean of its divisors is an integer number (77037352).

Almost surely, 2^999798709 is an apocalyptic number.

It is an amenable number.

999798709 is a deficient number, since it is larger than the sum of its proper divisors (232798923).

999798709 is a wasteful number, since it uses less digits than its factorization.

999798709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18556.

The product of its (nonzero) digits is 23147208, while the sum is 67.

The square root of 999798709 is about 31619.5937513435. The cubic root of 999798709 is about 999.9328984975.

The spelling of 999798709 in words is "nine hundred ninety-nine million, seven hundred ninety-eight thousand, seven hundred nine".