99705217 has 8 divisors (see below), whose sum is σ = 105073760. Its totient is φ = 94348800.

The previous prime is 99705209. The next prime is 99705223. The reversal of 99705217 is 71250799.

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 99705217 - 2³ = 99705209 is a prime.

It is a super-2 number, since 2×99705217² = 19882260594034178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99705217.

It is not an unprimeable number, because it can be changed into a prime (99705257) 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, 17473 + ... + 22465.

It is an arithmetic number, because the mean of its divisors is an integer number (13134220).

Almost surely, 2^99705217 is an apocalyptic number.

99705217 is the 4993-rd decagonal number.

It is an amenable number.

99705217 is a deficient number, since it is larger than the sum of its proper divisors (5368543).

99705217 is a wasteful number, since it uses less digits than its factorization.

99705217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6063.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 99705217 is about 9985.2499718335. The cubic root of 99705217 is about 463.7023473097.

The spelling of 99705217 in words is "ninety-nine million, seven hundred five thousand, two hundred seventeen".