8490221 has 8 divisors (see below), whose sum is σ = 8874624. Its totient is φ = 8114400.

The previous prime is 8490217. The next prime is 8490233. The reversal of 8490221 is 1220948.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8490221 - 2² = 8490217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8490271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (1109328).

Almost surely, 2^8490221 is an apocalyptic number.

It is an amenable number.

8490221 is a deficient number, since it is larger than the sum of its proper divisors (384403).

8490221 is a wasteful number, since it uses less digits than its factorization.

8490221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8490221 is about 2913.7983801217. The cubic root of 8490221 is about 204.0044613275.

The spelling of 8490221 in words is "eight million, four hundred ninety thousand, two hundred twenty-one".