4218918 has 32 divisors (see below), whose sum is σ = 9313920. Its totient is φ = 1263360.

The previous prime is 4218917. The next prime is 4218947. The reversal of 4218918 is 8198124.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4218917) 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, 6073 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (291060).

Almost surely, 2^4218918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4218918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4656960).

4218918 is an abundant number, since it is smaller than the sum of its proper divisors (5095002).

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

4218918 is a wasteful number, since it uses less digits than its factorization.

4218918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772.

The product of its digits is 4608, while the sum is 33.

The square root of 4218918 is about 2054.0004868549. Note that the first 3 decimals coincide. The cubic root of 4218918 is about 161.5847465833.

It can be divided in two parts, 421 and 8918, that added together give a palindrome (9339).

The spelling of 4218918 in words is "four million, two hundred eighteen thousand, nine hundred eighteen".