6443455 has 4 divisors (see below), whose sum is σ = 7732152. Its totient is φ = 5154760.

The previous prime is 6443447. The next prime is 6443461. The reversal of 6443455 is 5543446.

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

It is not a de Polignac number, because 6443455 - 2³ = 6443447 is a prime.

It is a super-2 number, since 2×6443455² = 83036224674050, which contains 22 as substring.

It is a Duffinian number.

6443455 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 644341 + ... + 644350.

It is an arithmetic number, because the mean of its divisors is an integer number (1933038).

Almost surely, 2^6443455 is an apocalyptic number.

6443455 is a deficient number, since it is larger than the sum of its proper divisors (1288697).

6443455 is a wasteful number, since it uses less digits than its factorization.

6443455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288696.

The product of its digits is 28800, while the sum is 31.

The square root of 6443455 is about 2538.3961471764. The cubic root of 6443455 is about 186.0828147042.

Subtracting from 6443455 its reverse (5543446), we obtain a palindrome (900009).

The spelling of 6443455 in words is "six million, four hundred forty-three thousand, four hundred fifty-five".