6443506 has 4 divisors (see below), whose sum is σ = 9665262. Its totient is φ = 3221752.

The previous prime is 6443501. The next prime is 6443537. The reversal of 6443506 is 6053446.

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

It can be written as a sum of positive squares in only one way, i.e., 4661281 + 1782225 = 2159^2 + 1335^2 .

It is not an unprimeable number, because it can be changed into a prime (6443501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610875 + ... + 1610878.

Almost surely, 2^6443506 is an apocalyptic number.

6443506 is a deficient number, since it is larger than the sum of its proper divisors (3221756).

6443506 is a wasteful number, since it uses less digits than its factorization.

6443506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221755.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6443506 is about 2538.4061928698. The cubic root of 6443506 is about 186.0833056519.

The spelling of 6443506 in words is "six million, four hundred forty-three thousand, five hundred six".