6388641 has 24 divisors (see below), whose sum is σ = 11007360. Its totient is φ = 3491136.

The previous prime is 6388637. The next prime is 6388667. The reversal of 6388641 is 1468836.

It is a happy number.

6388641 is a `hidden beast` number, since 6 + 3 + 8 + 8 + 641 = 666.

6388641 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6388641 - 2² = 6388637 is a prime.

6388641 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 6388596 and 6388605.

It is not an unprimeable number, because it can be changed into a prime (6388601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 756 + ... + 3653.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^6388641 is an apocalyptic number.

It is an amenable number.

6388641 is a deficient number, since it is larger than the sum of its proper divisors (4618719).

6388641 is a wasteful number, since it uses less digits than its factorization.

6388641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445 (or 4442 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6388641 is about 2527.5761116137. The cubic root of 6388641 is about 185.5536470309.

The spelling of 6388641 in words is "six million, three hundred eighty-eight thousand, six hundred forty-one".