4003218 has 24 divisors (see below), whose sum is σ = 8973900. Its totient is φ = 1288224.

The previous prime is 4003213. The next prime is 4003231. The reversal of 4003218 is 8123004.

It is a happy number.

4003218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3674889 + 328329 = 1917^2 + 573^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4003218.

It is not an unprimeable number, because it can be changed into a prime (4003213) 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 in 11 ways as a sum of consecutive naturals, for example, 3313 + ... + 4356.

Almost surely, 2^4003218 is an apocalyptic number.

4003218 is an abundant number, since it is smaller than the sum of its proper divisors (4970682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4003218 is a wasteful number, since it uses less digits than its factorization.

4003218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706 (or 7703 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4003218 is about 2000.8043382600. The cubic root of 4003218 is about 158.7826625913.

The spelling of 4003218 in words is "four million, three thousand, two hundred eighteen".