9999905 has 8 divisors (see below), whose sum is σ = 12164712.
Its totient is φ = 7890048.
The previous prime is 9999901. The next prime is 9999907. The reversal of 9999905 is 5099999.
9999905 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 4 ways, for example, as 2024929 + 7974976 = 1423^2 + 2824^2
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 9999905 - 22 = 9999901 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (9999901) 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, 13334 + ... + 14063.
It is an arithmetic number, because the mean of its divisors is an integer number (1520589).
Almost surely, 29999905 is an apocalyptic number.
It is an amenable number.
9999905 is a deficient number, since it is larger than the sum of its proper divisors (2164807).
9999905 is a wasteful number, since it uses less digits than its factorization.
9999905 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27475.
The product of its (nonzero) digits is 295245, while the sum is 50.
The square root of 9999905 is about 3162.2626393138.
The cubic root of 9999905 is about 215.4427867634.
The spelling of 9999905 in words is "nine million, nine hundred ninety-nine thousand, nine hundred five".