6381816 has 32 divisors (see below), whose sum is σ = 18234240. Its totient is φ = 1823328.

The previous prime is 6381811. The next prime is 6381821. The reversal of 6381816 is 6181836.

It is an interprime number because it is at equal distance from previous prime (6381811) and next prime (6381821).

It is a nude number because it is divisible by every one of its digits.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381811) 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, 18826 + ... + 19161.

It is an arithmetic number, because the mean of its divisors is an integer number (569820).

Almost surely, 2^6381816 is an apocalyptic number.

It is an amenable number.

6381816 is an abundant number, since it is smaller than the sum of its proper divisors (11852424).

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

6381816 is a wasteful number, since it uses less digits than its factorization.

6381816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38003 (or 37999 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 6381816 is about 2526.2256431285. The cubic root of 6381816 is about 185.4875476901.

The spelling of 6381816 in words is "six million, three hundred eighty-one thousand, eight hundred sixteen".