8509725 has 48 divisors (see below), whose sum is σ = 17875840. Its totient is φ = 3888000.

The previous prime is 8509703. The next prime is 8509727. The reversal of 8509725 is 5279058.

It is not a de Polignac number, because 8509725 - 2⁶ = 8509661 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8509725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8509727) 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 47 ways as a sum of consecutive naturals, for example, 3825 + ... + 5625.

Almost surely, 2^8509725 is an apocalyptic number.

It is an amenable number.

8509725 is an abundant number, since it is smaller than the sum of its proper divisors (9366115).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8509725 is a wasteful number, since it uses less digits than its factorization.

8509725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827 (or 1816 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 8509725 is about 2917.1432943892. The cubic root of 8509725 is about 204.1605569924.

The spelling of 8509725 in words is "eight million, five hundred nine thousand, seven hundred twenty-five".