9999925 has 24 divisors (see below), whose sum is σ = 13827240.
Its totient is φ = 7123200.
The previous prime is 9999907. The next prime is 9999929. The reversal of 9999925 is 5299999.
9999925 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 12 ways, for example, as 3538161 + 6461764 = 1881^2 + 2542^2
It is not a de Polignac number, because 9999925 - 211 = 9997877 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9999929) by changing a digit.
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 23 ways as a sum of consecutive naturals, for example, 8895 + ... + 9955.
It is an arithmetic number, because the mean of its divisors is an integer number (576135).
Almost surely, 29999925 is an apocalyptic number.
It is an amenable number.
9999925 is a deficient number, since it is larger than the sum of its proper divisors (3827315).
9999925 is a wasteful number, since it uses less digits than its factorization.
9999925 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1113 (or 1108 counting only the distinct ones).
The product of its digits is 590490, while the sum is 52.
The square root of 9999925 is about 3162.2658016049.
The cubic root of 9999925 is about 215.4429303932.
The spelling of 9999925 in words is "nine million, nine hundred ninety-nine thousand, nine hundred twenty-five".