9172845 has 80 divisors (see below), whose sum is σ = 18817920. Its totient is φ = 4233600.

The previous prime is 9172841. The next prime is 9172861. The reversal of 9172845 is 5482719.

It is not a de Polignac number, because 9172845 - 2² = 9172841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9172841) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 129160 + ... + 129230.

It is an arithmetic number, because the mean of its divisors is an integer number (235224).

Almost surely, 2^9172845 is an apocalyptic number.

It is an amenable number.

9172845 is an abundant number, since it is smaller than the sum of its proper divisors (9645075).

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

9172845 is a wasteful number, since it uses less digits than its factorization.

9172845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 119 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 9172845 is about 3028.6705004011. The cubic root of 9172845 is about 209.3315479741.

The spelling of 9172845 in words is "nine million, one hundred seventy-two thousand, eight hundred forty-five".