8906221 has 4 divisors (see below), whose sum is σ = 9293472. Its totient is φ = 8518972.

The previous prime is 8906197. The next prime is 8906237. The reversal of 8906221 is 1226098.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1226098 = 2 ⋅613049.

It is a cyclic number.

It is not a de Polignac number, because 8906221 - 2⁵ = 8906189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8906221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8906251) 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, 193591 + ... + 193636.

It is an arithmetic number, because the mean of its divisors is an integer number (2323368).

Almost surely, 2^8906221 is an apocalyptic number.

It is an amenable number.

8906221 is a deficient number, since it is larger than the sum of its proper divisors (387251).

8906221 is a wasteful number, since it uses less digits than its factorization.

8906221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387250.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8906221 is about 2984.3292378690. The cubic root of 8906221 is about 207.2833835645.

The spelling of 8906221 in words is "eight million, nine hundred six thousand, two hundred twenty-one".