6831987 has 4 divisors (see below), whose sum is σ = 9109320. Its totient is φ = 4554656.

The previous prime is 6831971. The next prime is 6831991. The reversal of 6831987 is 7891386.

6831987 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 a cyclic number.

It is not a de Polignac number, because 6831987 - 2⁴ = 6831971 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6833987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1138662 + ... + 1138667.

It is an arithmetic number, because the mean of its divisors is an integer number (2277330).

Almost surely, 2^6831987 is an apocalyptic number.

6831987 is a deficient number, since it is larger than the sum of its proper divisors (2277333).

6831987 is a wasteful number, since it uses less digits than its factorization.

6831987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277332.

The product of its digits is 72576, while the sum is 42.

The square root of 6831987 is about 2613.8069936397. The cubic root of 6831987 is about 189.7502443230.

The spelling of 6831987 in words is "six million, eight hundred thirty-one thousand, nine hundred eighty-seven".