8686221 has 4 divisors (see below), whose sum is σ = 11581632. Its totient is φ = 5790812.

The previous prime is 8686213. The next prime is 8686241. The reversal of 8686221 is 1226868.

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 8686221 - 2³ = 8686213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8686241) 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, 1447701 + ... + 1447706.

It is an arithmetic number, because the mean of its divisors is an integer number (2895408).

Almost surely, 2^8686221 is an apocalyptic number.

It is an amenable number.

8686221 is a deficient number, since it is larger than the sum of its proper divisors (2895411).

8686221 is a wasteful number, since it uses less digits than its factorization.

8686221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895410.

The product of its digits is 9216, while the sum is 33.

The square root of 8686221 is about 2947.2395559235. The cubic root of 8686221 is about 205.5623741374.

The spelling of 8686221 in words is "eight million, six hundred eighty-six thousand, two hundred twenty-one".