6401387 has 2 divisors, whose sum is σ = 6401388. Its totient is φ = 6401386.

The previous prime is 6401377. The next prime is 6401389. The reversal of 6401387 is 7831046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6401387 - 2¹⁰ = 6400363 is a prime.

Together with 6401389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6401389) 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 as a sum of consecutive naturals, namely, 3200693 + 3200694.

It is an arithmetic number, because the mean of its divisors is an integer number (3200694).

Almost surely, 2^6401387 is an apocalyptic number.

6401387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401387 is an equidigital number, since it uses as much as digits as its factorization.

6401387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 6401387 is about 2530.0962432287. The cubic root of 6401387 is about 185.6769646335.

The spelling of 6401387 in words is "six million, four hundred one thousand, three hundred eighty-seven".