8409825 has 30 divisors (see below), whose sum is σ = 15581654. Its totient is φ = 4484160.

The previous prime is 8409721. The next prime is 8409829. The reversal of 8409825 is 5289048.

It can be written as a sum of positive squares in 3 ways, for example, as 63504 + 8346321 = 252^2 + 2889^2 .

It is not a de Polignac number, because 8409825 - 2¹⁰ = 8408801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8409825.

It is not an unprimeable number, because it can be changed into a prime (8409829) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 52 + ... + 4101.

Almost surely, 2^8409825 is an apocalyptic number.

It is an amenable number.

8409825 is a deficient number, since it is larger than the sum of its proper divisors (7171829).

8409825 is a wasteful number, since it uses less digits than its factorization.

8409825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175 (or 4161 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 8409825 is about 2899.9698274292. The cubic root of 8409825 is about 203.3584951990.

The spelling of 8409825 in words is "eight million, four hundred nine thousand, eight hundred twenty-five".