6388381 has 16 divisors (see below), whose sum is σ = 6969600. Its totient is φ = 5842368.

The previous prime is 6388373. The next prime is 6388391. The reversal of 6388381 is 1838836.

It is a cyclic number.

It is not a de Polignac number, because 6388381 - 2³ = 6388373 is a prime.

It is a super-2 number, since 2×6388381² = 81622823602322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6388381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6388391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58555 + ... + 58663.

It is an arithmetic number, because the mean of its divisors is an integer number (435600).

Almost surely, 2^6388381 is an apocalyptic number.

It is an amenable number.

6388381 is a deficient number, since it is larger than the sum of its proper divisors (581219).

6388381 is a wasteful number, since it uses less digits than its factorization.

6388381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its digits is 27648, while the sum is 37.

The square root of 6388381 is about 2527.5246784156. The cubic root of 6388381 is about 185.5511298235.

The spelling of 6388381 in words is "six million, three hundred eighty-eight thousand, three hundred eighty-one".