987289 has 4 divisors (see below), whose sum is σ = 996624. Its totient is φ = 977956.

The previous prime is 987251. The next prime is 987293. The reversal of 987289 is 982789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987289 is a prime.

It is a Duffinian number.

987289 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (987209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507 + ... + 4720.

It is an arithmetic number, because the mean of its divisors is an integer number (249156).

2⁹⁸⁷²⁸⁹ is an apocalyptic number.

It is an amenable number.

987289 is a deficient number, since it is larger than the sum of its proper divisors (9335).

987289 is a wasteful number, since it uses less digits than its factorization.

987289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334.

The product of its digits is 72576, while the sum is 43.

The square root of 987289 is about 993.6241744241. The cubic root of 987289 is about 99.5744919974.

The spelling of 987289 in words is "nine hundred eighty-seven thousand, two hundred eighty-nine".