6445855 has 16 divisors (see below), whose sum is σ = 8404704. Its totient is φ = 4717440.

The previous prime is 6445853. The next prime is 6445871. The reversal of 6445855 is 5585446.

It is not a de Polignac number, because 6445855 - 2¹ = 6445853 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445853) 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 15 ways as a sum of consecutive naturals, for example, 8137 + ... + 8893.

It is an arithmetic number, because the mean of its divisors is an integer number (525294).

Almost surely, 2^6445855 is an apocalyptic number.

6445855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6445855 is a deficient number, since it is larger than the sum of its proper divisors (1958849).

6445855 is a wasteful number, since it uses less digits than its factorization.

6445855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 96000, while the sum is 37.

The square root of 6445855 is about 2538.8688426148. The cubic root of 6445855 is about 186.1059153191.

The spelling of 6445855 in words is "six million, four hundred forty-five thousand, eight hundred fifty-five".