6381687 has 8 divisors (see below), whose sum is σ = 9163504. Its totient is φ = 3927168.

The previous prime is 6381679. The next prime is 6381689. The reversal of 6381687 is 7861836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6381687 - 2³ = 6381679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 163633 = 6381687 / (6 + 3 + 8 + 1 + 6 + 8 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381689) 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 7 ways as a sum of consecutive naturals, for example, 81778 + ... + 81855.

It is an arithmetic number, because the mean of its divisors is an integer number (1145438).

Almost surely, 2^6381687 is an apocalyptic number.

6381687 is a deficient number, since it is larger than the sum of its proper divisors (2781817).

6381687 is a wasteful number, since it uses less digits than its factorization.

6381687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163649.

The product of its digits is 48384, while the sum is 39.

The square root of 6381687 is about 2526.2001108384. The cubic root of 6381687 is about 185.4862978862.

It can be divided in two parts, 63816 and 87, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 6381687 in words is "six million, three hundred eighty-one thousand, six hundred eighty-seven".