99999709 has 8 divisors (see below), whose sum is σ = 100890072. Its totient is φ = 99113280.

The previous prime is 99999703. The next prime is 99999721. The reversal of 99999709 is 90799999.

It can be written as a sum of positive squares in 4 ways, for example, as 33120025 + 66879684 = 5755^2 + 8178^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999709 - 2⁵ = 99999677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72147 + ... + 73519.

It is an arithmetic number, because the mean of its divisors is an integer number (12611259).

Almost surely, 2^99999709 is an apocalyptic number.

It is an amenable number.

99999709 is a deficient number, since it is larger than the sum of its proper divisors (890363).

99999709 is a wasteful number, since it uses less digits than its factorization.

99999709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967.

The product of its (nonzero) digits is 3720087, while the sum is 61.

The square root of 99999709 is about 9999.9854499894. The cubic root of 99999709 is about 464.1584331267.

The spelling of 99999709 in words is "ninety-nine million, nine hundred ninety-nine thousand, seven hundred nine".