1987565 has 8 divisors (see below), whose sum is σ = 2462208. Its totient is φ = 1538640.

The previous prime is 1987549. The next prime is 1987577. The reversal of 1987565 is 5657891.

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

It is not a de Polignac number, because 1987565 - 2⁴ = 1987549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6257 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (307776).

2^1987565 is an apocalyptic number.

It is an amenable number.

1987565 is a deficient number, since it is larger than the sum of its proper divisors (474643).

1987565 is a wasteful number, since it uses less digits than its factorization.

1987565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12859.

The product of its digits is 75600, while the sum is 41.

The square root of 1987565 is about 1409.8102709230. The cubic root of 1987565 is about 125.7304433065.

It can be divided in two parts, 1987 and 565, that added together give a palindrome (2552).

The spelling of 1987565 in words is "one million, nine hundred eighty-seven thousand, five hundred sixty-five".