6319987 has 4 divisors (see below), whose sum is σ = 6327720. Its totient is φ = 6312256.

The previous prime is 6319981. The next prime is 6319993. The reversal of 6319987 is 7899136.

6319987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (6319981) and next prime (6319993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6319987 is a prime.

It is a Duffinian number.

6319987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6319981) 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 3 ways as a sum of consecutive naturals, for example, 2473 + ... + 4330.

It is an arithmetic number, because the mean of its divisors is an integer number (1581930).

Almost surely, 2^6319987 is an apocalyptic number.

6319987 is a deficient number, since it is larger than the sum of its proper divisors (7733).

6319987 is an equidigital number, since it uses as much as digits as its factorization.

6319987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732.

The product of its digits is 81648, while the sum is 43.

The square root of 6319987 is about 2513.9584324328. The cubic root of 6319987 is about 184.8865825391.

The spelling of 6319987 in words is "six million, three hundred nineteen thousand, nine hundred eighty-seven".