6387987 has 4 divisors (see below), whose sum is σ = 8517320. Its totient is φ = 4258656.

The previous prime is 6387977. The next prime is 6388021. The reversal of 6387987 is 7897836.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6387987 - 2¹⁶ = 6322451 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6387907) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1064662 + ... + 1064667.

It is an arithmetic number, because the mean of its divisors is an integer number (2129330).

Almost surely, 2^6387987 is an apocalyptic number.

6387987 is a deficient number, since it is larger than the sum of its proper divisors (2129333).

6387987 is a wasteful number, since it uses less digits than its factorization.

6387987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129332.

The product of its digits is 508032, while the sum is 48.

The square root of 6387987 is about 2527.4467353438. The cubic root of 6387987 is about 185.5473151560.

The spelling of 6387987 in words is "six million, three hundred eighty-seven thousand, nine hundred eighty-seven".