8509172 has 48 divisors (see below), whose sum is σ = 18100992. Its totient is φ = 3421440.

The previous prime is 8509147. The next prime is 8509183. The reversal of 8509172 is 2719058.

8509172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46922 + ... + 47102.

It is an arithmetic number, because the mean of its divisors is an integer number (377104).

Almost surely, 2^8509172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8509172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9050496).

8509172 is an abundant number, since it is smaller than the sum of its proper divisors (9591820).

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

8509172 is a wasteful number, since it uses less digits than its factorization.

8509172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 8509172 is about 2917.0485083385. The cubic root of 8509172 is about 204.1561344745.

The spelling of 8509172 in words is "eight million, five hundred nine thousand, one hundred seventy-two".