6381378 has 48 divisors (see below), whose sum is σ = 14901120. Its totient is φ = 1967328.

The previous prime is 6381371. The next prime is 6381379. The reversal of 6381378 is 8731836.

6381378 is a `hidden beast` number, since 638 + 13 + 7 + 8 = 666.

6381378 is a nontrivial binomial coefficient, being equal to C(3573, 2).

It is not an unprimeable number, because it can be changed into a prime (6381371) 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 23 ways as a sum of consecutive naturals, for example, 15876 + ... + 16272.

It is an arithmetic number, because the mean of its divisors is an integer number (310440).

Almost surely, 2^6381378 is an apocalyptic number.

6381378 is the 3572-nd triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6381378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7450560).

6381378 is an abundant number, since it is smaller than the sum of its proper divisors (8519742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6381378 is a wasteful number, since it uses less digits than its factorization.

6381378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 468 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 6381378 is about 2526.1389510476. The cubic root of 6381378 is about 185.4833041015.

It can be divided in two parts, 638 and 1378, that added together give a triangular number (2016 = T₆₃).

The spelling of 6381378 in words is "six million, three hundred eighty-one thousand, three hundred seventy-eight".