6381978 has 16 divisors (see below), whose sum is σ = 13075776. Its totient is φ = 2075360.

The previous prime is 6381961. The next prime is 6381979. The reversal of 6381978 is 8791836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381979) 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, 12726 + ... + 13217.

It is an arithmetic number, because the mean of its divisors is an integer number (817236).

Almost surely, 2^6381978 is an apocalyptic number.

6381978 is an abundant number, since it is smaller than the sum of its proper divisors (6693798).

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

6381978 is a wasteful number, since it uses less digits than its factorization.

6381978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25989.

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

The square root of 6381978 is about 2526.2577065691. The cubic root of 6381978 is about 185.4891171874.

The spelling of 6381978 in words is "six million, three hundred eighty-one thousand, nine hundred seventy-eight".