6391387 has 2 divisors, whose sum is σ = 6391388. Its totient is φ = 6391386.

The previous prime is 6391379. The next prime is 6391409. The reversal of 6391387 is 7831936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6391387 - 2³ = 6391379 is a prime.

It is not a weakly prime, because it can be changed into another prime (6391327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195693 + 3195694.

It is an arithmetic number, because the mean of its divisors is an integer number (3195694).

Almost surely, 2^6391387 is an apocalyptic number.

6391387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391387 is an equidigital number, since it uses as much as digits as its factorization.

6391387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 6391387 is about 2528.1192614274. The cubic root of 6391387 is about 185.5802284447.

It can be divided in two parts, 63913 and 87, that added together give a cube (64000 = 40³).

The spelling of 6391387 in words is "six million, three hundred ninety-one thousand, three hundred eighty-seven".