987221 has 8 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 927072.

The previous prime is 987211. The next prime is 987227. The reversal of 987221 is 122789.

It is a happy number.

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 987221 - 2¹⁰ = 986197 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 987221.

It is not an unprimeable number, because it can be changed into a prime (987227) 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, 4121 + ... + 4353.

It is an arithmetic number, because the mean of its divisors is an integer number (131040).

2⁹⁸⁷²²¹ is an apocalyptic number.

It is an amenable number.

987221 is a deficient number, since it is larger than the sum of its proper divisors (61099).

987221 is a wasteful number, since it uses less digits than its factorization.

987221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its digits is 2016, while the sum is 29.

The square root of 987221 is about 993.5899556658. The cubic root of 987221 is about 99.5722058648.

The spelling of 987221 in words is "nine hundred eighty-seven thousand, two hundred twenty-one".