987805387 has 4 divisors (see below), whose sum is σ = 990035640. Its totient is φ = 985575136.

The previous prime is 987805367. The next prime is 987805397. The reversal of 987805387 is 783508789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783508789 = 7 ⋅111929827.

It is a cyclic number.

It is not a de Polignac number, because 987805387 - 2¹¹ = 987803339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987805367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114462 + ... + 1115347.

It is an arithmetic number, because the mean of its divisors is an integer number (247508910).

Almost surely, 2^987805387 is an apocalyptic number.

987805387 is a deficient number, since it is larger than the sum of its proper divisors (2230253).

987805387 is a wasteful number, since it uses less digits than its factorization.

987805387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230252.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The square root of 987805387 is about 31429.3714063772. The cubic root of 987805387 is about 995.9184929645.

The spelling of 987805387 in words is "nine hundred eighty-seven million, eight hundred five thousand, three hundred eighty-seven".