8217945 has 48 divisors (see below), whose sum is σ = 15155712. Its totient is φ = 4112640.

The previous prime is 8217931. The next prime is 8217947. The reversal of 8217945 is 5497128.

It is not a de Polignac number, because 8217945 - 2⁴ = 8217929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8217947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59917 + ... + 60053.

It is an arithmetic number, because the mean of its divisors is an integer number (315744).

Almost surely, 2^8217945 is an apocalyptic number.

It is an amenable number.

8217945 is a deficient number, since it is larger than the sum of its proper divisors (6937767).

8217945 is a wasteful number, since it uses less digits than its factorization.

8217945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 219 counting only the distinct ones).

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

The square root of 8217945 is about 2866.6958331850. The cubic root of 8217945 is about 201.7999604485.

The spelling of 8217945 in words is "eight million, two hundred seventeen thousand, nine hundred forty-five".