4221818 has 4 divisors (see below), whose sum is σ = 6332730. Its totient is φ = 2110908.

The previous prime is 4221799. The next prime is 4221827. The reversal of 4221818 is 8181224.

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., 3853369 + 368449 = 1963^2 + 607^2 .

4221818 is a modest number, since divided by 1818 gives 422 as remainder.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 1055453 + ... + 1055456.

Almost surely, 2^4221818 is an apocalyptic number.

4221818 is a deficient number, since it is larger than the sum of its proper divisors (2110912).

4221818 is a wasteful number, since it uses less digits than its factorization.

4221818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110911.

The product of its digits is 1024, while the sum is 26.

The square root of 4221818 is about 2054.7063050470. The cubic root of 4221818 is about 161.6217614798.

The spelling of 4221818 in words is "four million, two hundred twenty-one thousand, eight hundred eighteen".