4218666 has 32 divisors (see below), whose sum is σ = 8959488. Its totient is φ = 1321920.

The previous prime is 4218631. The next prime is 4218667. The reversal of 4218666 is 6668124.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (4218667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6576 + ... + 7188.

It is an arithmetic number, because the mean of its divisors is an integer number (279984).

Almost surely, 2^4218666 is an apocalyptic number.

4218666 is an abundant number, since it is smaller than the sum of its proper divisors (4740822).

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

4218666 is a wasteful number, since it uses less digits than its factorization.

4218666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686.

The product of its digits is 13824, while the sum is 33.

The square root of 4218666 is about 2053.9391422338. The cubic root of 4218666 is about 161.5815293156.

It can be divided in two parts, 4218 and 666, that added together give a palindrome (4884).

The spelling of 4218666 in words is "four million, two hundred eighteen thousand, six hundred sixty-six".