4218138 has 12 divisors (see below), whose sum is σ = 9139338. Its totient is φ = 1406040.

The previous prime is 4218113. The next prime is 4218157. The reversal of 4218138 is 8318124.

It can be written as a sum of positive squares in only one way, i.e., 2712609 + 1505529 = 1647^2 + 1227^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117153 + ... + 117188.

Almost surely, 2^4218138 is an apocalyptic number.

4218138 is an abundant number, since it is smaller than the sum of its proper divisors (4921200).

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

4218138 is a wasteful number, since it uses less digits than its factorization.

4218138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234349 (or 234346 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 4218138 is about 2053.8106047053. The cubic root of 4218138 is about 161.5747879581.

It can be divided in two parts, 421813 and 8, that added together give a triangular number (421821 = T₉₁₈).

The spelling of 4218138 in words is "four million, two hundred eighteen thousand, one hundred thirty-eight".