7887987 has 6 divisors (see below), whose sum is σ = 11393772. Its totient is φ = 5258652.

The previous prime is 7887959. The next prime is 7887989. The reversal of 7887987 is 7897887.

It is not a de Polignac number, because 7887987 - 2⁶ = 7887923 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7887989) 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 5 ways as a sum of consecutive naturals, for example, 438213 + ... + 438230.

It is an arithmetic number, because the mean of its divisors is an integer number (1898962).

Almost surely, 2^7887987 is an apocalyptic number.

7887987 is a deficient number, since it is larger than the sum of its proper divisors (3505785).

7887987 is a wasteful number, since it uses less digits than its factorization.

7887987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876449 (or 876446 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 7887987 is about 2808.5560346911. The cubic root of 7887987 is about 199.0621675587.

The spelling of 7887987 in words is "seven million, eight hundred eighty-seven thousand, nine hundred eighty-seven".