9999955 has 16 divisors (see below), whose sum is σ = 14008320.
Its totient is φ = 6710112.
The previous prime is 9999943. The next prime is 9999971. The reversal of 9999955 is 5599999.
It is a cyclic number.
It is not a de Polignac number, because 9999955 - 215 = 9967187 is a prime.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 9999896 and 9999905.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1395 + ... + 4684.
It is an arithmetic number, because the mean of its divisors is an integer number (875520).
Almost surely, 29999955 is an apocalyptic number.
9999955 is a deficient number, since it is larger than the sum of its proper divisors (4008365).
9999955 is a wasteful number, since it uses less digits than its factorization.
9999955 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6138.
The product of its digits is 1476225, while the sum is 55.
The square root of 9999955 is about 3162.2705450356.
The cubic root of 9999955 is about 215.4431458375.
The spelling of 9999955 in words is "nine million, nine hundred ninety-nine thousand, nine hundred fifty-five".