6397555 has 4 divisors (see below), whose sum is σ = 7677072. Its totient is φ = 5118040.

The previous prime is 6397553. The next prime is 6397571. The reversal of 6397555 is 5557936.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6397555 - 2¹ = 6397553 is a prime.

It is a Duffinian number.

6397555 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (6397553) 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, 639751 + ... + 639760.

It is an arithmetic number, because the mean of its divisors is an integer number (1919268).

Almost surely, 2^6397555 is an apocalyptic number.

6397555 is a deficient number, since it is larger than the sum of its proper divisors (1279517).

6397555 is a wasteful number, since it uses less digits than its factorization.

6397555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279516.

The product of its digits is 141750, while the sum is 40.

The square root of 6397555 is about 2529.3388464182. The cubic root of 6397555 is about 185.6399072400.

The spelling of 6397555 in words is "six million, three hundred ninety-seven thousand, five hundred fifty-five".