6381685 has 8 divisors (see below), whose sum is σ = 7734456. Its totient is φ = 5054400.

The previous prime is 6381679. The next prime is 6381689. The reversal of 6381685 is 5861836.

It can be written as a sum of positive squares in 4 ways, for example, as 877969 + 5503716 = 937^2 + 2346^2 .

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

It is not a de Polignac number, because 6381685 - 2¹⁵ = 6348917 is a prime.

It is a Duffinian number.

6381685 is a lucky 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5814 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (966807).

Almost surely, 2^6381685 is an apocalyptic number.

It is an amenable number.

6381685 is a deficient number, since it is larger than the sum of its proper divisors (1352771).

6381685 is a wasteful number, since it uses less digits than its factorization.

6381685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12743.

The product of its digits is 34560, while the sum is 37.

The square root of 6381685 is about 2526.1997149869. The cubic root of 6381685 is about 185.4862785093.

The spelling of 6381685 in words is "six million, three hundred eighty-one thousand, six hundred eighty-five".