998221 has 8 divisors (see below), whose sum is σ = 1160640. Its totient is φ = 840768.

The previous prime is 998219. The next prime is 998237. The reversal of 998221 is 122899.

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 998221 - 2¹ = 998219 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (145080).

2⁹⁹⁸²²¹ is an apocalyptic number.

It is an amenable number.

998221 is a deficient number, since it is larger than the sum of its proper divisors (162419).

998221 is a wasteful number, since it uses less digits than its factorization.

998221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483.

The product of its digits is 2592, while the sum is 31.

The square root of 998221 is about 999.1101040426. The cubic root of 998221 is about 99.9406648003.

The spelling of 998221 in words is "nine hundred ninety-eight thousand, two hundred twenty-one".