6396391 has 4 divisors (see below), whose sum is σ = 6401592. Its totient is φ = 6391192.

The previous prime is 6396389. The next prime is 6396409. The reversal of 6396391 is 1936936.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6396391 - 2¹ = 6396389 is a prime.

It is a Duffinian number.

6396391 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6396391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6396361) 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 3 ways as a sum of consecutive naturals, for example, 396 + ... + 3598.

It is an arithmetic number, because the mean of its divisors is an integer number (1600398).

Almost surely, 2^6396391 is an apocalyptic number.

6396391 is a deficient number, since it is larger than the sum of its proper divisors (5201).

6396391 is a wasteful number, since it uses less digits than its factorization.

6396391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5200.

The product of its digits is 26244, while the sum is 37.

The square root of 6396391 is about 2529.1087362943. The cubic root of 6396391 is about 185.6286478365.

The spelling of 6396391 in words is "six million, three hundred ninety-six thousand, three hundred ninety-one".