9988225 has 24 divisors (see below), whose sum is σ = 13552952.
Its totient is φ = 7257600.
The previous prime is 9988213. The next prime is 9988229. The reversal of 9988225 is 5228899.
It can be written as a sum of positive squares in 12 ways, for example, as 7551504 + 2436721 = 2748^2 + 1561^2
It is not a de Polignac number, because 9988225 - 217 = 9857153 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (9988229) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23515 + ... + 23935.
Almost surely, 29988225 is an apocalyptic number.
9988225 is the 1825-th octagonal number.
It is an amenable number.
9988225 is a deficient number, since it is larger than the sum of its proper divisors (3564727).
9988225 is a wasteful number, since it uses less digits than its factorization.
9988225 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 517 (or 512 counting only the distinct ones).
The product of its digits is 103680, while the sum is 43.
The square root of 9988225 is about 3160.4153208083.
The cubic root of 9988225 is about 215.3588742295.
The spelling of 9988225 in words is "nine million, nine hundred eighty-eight thousand, two hundred twenty-five".