987565 has 8 divisors (see below), whose sum is σ = 1191168. Its totient is φ = 786000.

The previous prime is 987559. The next prime is 987587. The reversal of 987565 is 565789.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 987565 - 2⁵ = 987533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940 + ... + 1690.

It is an arithmetic number, because the mean of its divisors is an integer number (148896).

2⁹⁸⁷⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

987565 is a deficient number, since it is larger than the sum of its proper divisors (203603).

987565 is a wasteful number, since it uses less digits than its factorization.

987565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019.

The product of its digits is 75600, while the sum is 40.

The square root of 987565 is about 993.7630502288. The cubic root of 987565 is about 99.5837699290.

The spelling of 987565 in words is "nine hundred eighty-seven thousand, five hundred sixty-five".