9999875 has 8 divisors (see below), whose sum is σ = 12480000.
Its totient is φ = 7999800.
The previous prime is 9999863. The next prime is 9999877. The reversal of 9999875 is 5789999.
It is not a de Polignac number, because 9999875 - 210 = 9998851 is a prime.
It is an Ulam number.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 9999875.
It is not an unprimeable number, because it can be changed into a prime (9999877) 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, 39875 + ... + 40124.
It is an arithmetic number, because the mean of its divisors is an integer number (1560000).
Almost surely, 29999875 is an apocalyptic number.
9999875 is a deficient number, since it is larger than the sum of its proper divisors (2480125).
9999875 is an equidigital number, since it uses as much as digits as its factorization.
9999875 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 80014 (or 80004 counting only the distinct ones).
The product of its digits is 1837080, while the sum is 56.
The square root of 9999875 is about 3162.2578958712.
The cubic root of 9999875 is about 215.4425713183.
The spelling of 9999875 in words is "nine million, nine hundred ninety-nine thousand, eight hundred seventy-five".