8666172 has 18 divisors (see below), whose sum is σ = 21906248. Its totient is φ = 2888712.

The previous prime is 8666167. The next prime is 8666173. The reversal of 8666172 is 2716668.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 240727 = 8666172 / (8 + 6 + 6 + 6 + 1 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8666173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120328 + ... + 120399.

Almost surely, 2^8666172 is an apocalyptic number.

It is an amenable number.

8666172 is an abundant number, since it is smaller than the sum of its proper divisors (13240076).

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

8666172 is a wasteful number, since it uses less digits than its factorization.

8666172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240737 (or 240732 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 8666172 is about 2943.8362726212. The cubic root of 8666172 is about 205.4040968316.

The spelling of 8666172 in words is "eight million, six hundred sixty-six thousand, one hundred seventy-two".