6388989 has 16 divisors (see below), whose sum is σ = 8816640. Its totient is φ = 4112640.

The previous prime is 6388981. The next prime is 6389017. The reversal of 6388989 is 9898836.

It is not a de Polignac number, because 6388989 - 2³ = 6388981 is a prime.

It is a Curzon number.

6388989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6388981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15417 + ... + 15825.

It is an arithmetic number, because the mean of its divisors is an integer number (551040).

Almost surely, 2^6388989 is an apocalyptic number.

It is an amenable number.

6388989 is a deficient number, since it is larger than the sum of its proper divisors (2427651).

6388989 is a wasteful number, since it uses less digits than its factorization.

6388989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580.

The product of its digits is 746496, while the sum is 51.

The square root of 6388989 is about 2527.6449513332. The cubic root of 6388989 is about 185.5570161093.

The spelling of 6388989 in words is "six million, three hundred eighty-eight thousand, nine hundred eighty-nine".