987583 has 4 divisors (see below), whose sum is σ = 990360. Its totient is φ = 984808.

The previous prime is 987559. The next prime is 987587. The reversal of 987583 is 385789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 385789 = 317 ⋅1217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987587) 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 3 ways as a sum of consecutive naturals, for example, 760 + ... + 1597.

It is an arithmetic number, because the mean of its divisors is an integer number (247590).

2⁹⁸⁷⁵⁸³ is an apocalyptic number.

987583 is a deficient number, since it is larger than the sum of its proper divisors (2777).

987583 is a wasteful number, since it uses less digits than its factorization.

987583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776.

The product of its digits is 60480, while the sum is 40.

The square root of 987583 is about 993.7721066723. The cubic root of 987583 is about 99.5843749514.

The spelling of 987583 in words is "nine hundred eighty-seven thousand, five hundred eighty-three".