987321 has 16 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 612480.

The previous prime is 987313. The next prime is 987353. The reversal of 987321 is 123789.

It is a happy number.

987321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 987321 - 2³ = 987313 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (987361) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2655 + ... + 3003.

It is an arithmetic number, because the mean of its divisors is an integer number (88200).

2⁹⁸⁷³²¹ is an apocalyptic number.

It is an amenable number.

987321 is a deficient number, since it is larger than the sum of its proper divisors (423879).

987321 is a wasteful number, since it uses less digits than its factorization.

987321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its digits is 3024, while the sum is 30.

The square root of 987321 is about 993.6402769614. The cubic root of 987321 is about 99.5755677883.

The spelling of 987321 in words is "nine hundred eighty-seven thousand, three hundred twenty-one".