6398221 has 8 divisors (see below), whose sum is σ = 6529824. Its totient is φ = 6268080.

The previous prime is 6398207. The next prime is 6398237. The reversal of 6398221 is 1228936.

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 6398221 - 2¹³ = 6390029 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 3 + 9 + 8⁶ + 2¹⁸ + 2²² + 1 .

It is a Duffinian number.

6398221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12786 + ... + 13276.

It is an arithmetic number, because the mean of its divisors is an integer number (816228).

Almost surely, 2^6398221 is an apocalyptic number.

It is an amenable number.

6398221 is a deficient number, since it is larger than the sum of its proper divisors (131603).

6398221 is a wasteful number, since it uses less digits than its factorization.

6398221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its digits is 5184, while the sum is 31.

The square root of 6398221 is about 2529.4704979501. The cubic root of 6398221 is about 185.6463488617.

The spelling of 6398221 in words is "six million, three hundred ninety-eight thousand, two hundred twenty-one".