8220917 has 4 divisors (see below), whose sum is σ = 8297856. Its totient is φ = 8143980.

The previous prime is 8220899. The next prime is 8220923. The reversal of 8220917 is 7190228.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8220917 - 2⁶ = 8220853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8220917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38309 + ... + 38522.

It is an arithmetic number, because the mean of its divisors is an integer number (2074464).

Almost surely, 2^8220917 is an apocalyptic number.

It is an amenable number.

8220917 is a deficient number, since it is larger than the sum of its proper divisors (76939).

8220917 is a wasteful number, since it uses less digits than its factorization.

8220917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76938.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 8220917 is about 2867.2141531459. The cubic root of 8220917 is about 201.8242843396.

The spelling of 8220917 in words is "eight million, two hundred twenty thousand, nine hundred seventeen".