6438218 has 12 divisors (see below), whose sum is σ = 9892818. Its totient is φ = 3142440.

The previous prime is 6438199. The next prime is 6438241. The reversal of 6438218 is 8128346.

It can be written as a sum of positive squares in only one way, i.e., 6436369 + 1849 = 2537^2 + 43^2 .

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 2828 + ... + 4568.

Almost surely, 2^6438218 is an apocalyptic number.

6438218 is a deficient number, since it is larger than the sum of its proper divisors (3454600).

6438218 is a wasteful number, since it uses less digits than its factorization.

6438218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829 (or 1786 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 6438218 is about 2537.3643806123. The cubic root of 6438218 is about 186.0323873151.

The spelling of 6438218 in words is "six million, four hundred thirty-eight thousand, two hundred eighteen".