9815625 has 36 divisors (see below), whose sum is σ = 17772300. Its totient is φ = 5220000.

The previous prime is 9815599. The next prime is 9815629. The reversal of 9815625 is 5265189.

It is a happy number.

9815625 is a `hidden beast` number, since 98 + 1 + 562 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 7112889 + 2702736 = 2667^2 + 1644^2 .

It is not a de Polignac number, because 9815625 - 2⁵ = 9815593 is a prime.

9815625 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9815625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9815629) 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 35 ways as a sum of consecutive naturals, for example, 27951 + ... + 28299.

It is an arithmetic number, because the mean of its divisors is an integer number (493675).

Almost surely, 2^9815625 is an apocalyptic number.

It is an amenable number.

9815625 is a deficient number, since it is larger than the sum of its proper divisors (7956675).

9815625 is an equidigital number, since it uses as much as digits as its factorization.

9815625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 357 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 9815625 is about 3132.9897861308. The cubic root of 9815625 is about 214.1111673849. Note that the first 4 decimals are identical.

It can be divided in two parts, 9815 and 625, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 9815625 in words is "nine million, eight hundred fifteen thousand, six hundred twenty-five".