9999625 has 8 divisors (see below), whose sum is σ = 12479688.
Its totient is φ = 7999600.
The previous prime is 9999601. The next prime is 9999637. The reversal of 9999625 is 5269999.
It can be written as a sum of positive squares in 4 ways, for example, as 1871424 + 8128201 = 1368^2 + 2851^2
It is not a de Polignac number, because 9999625 - 25 = 9999593 is a prime.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39874 + ... + 40123.
It is an arithmetic number, because the mean of its divisors is an integer number (1559961).
Almost surely, 29999625 is an apocalyptic number.
It is an amenable number.
9999625 is a deficient number, since it is larger than the sum of its proper divisors (2480063).
9999625 is an equidigital number, since it uses as much as digits as its factorization.
9999625 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 80012 (or 80002 counting only the distinct ones).
The product of its digits is 393660, while the sum is 49.
The square root of 9999625 is about 3162.2183669064.
The cubic root of 9999625 is about 215.4407759262.
The spelling of 9999625 in words is "nine million, nine hundred ninety-nine thousand, six hundred twenty-five".