4218638 has 16 divisors (see below), whose sum is σ = 6502560. Its totient is φ = 2052000.

The previous prime is 4218631. The next prime is 4218667. The reversal of 4218638 is 8368124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4218631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18308 + ... + 18536.

It is an arithmetic number, because the mean of its divisors is an integer number (406410).

Almost surely, 2^4218638 is an apocalyptic number.

4218638 is a deficient number, since it is larger than the sum of its proper divisors (2283922).

4218638 is a wasteful number, since it uses less digits than its factorization.

4218638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443.

The product of its digits is 9216, while the sum is 32.

The square root of 4218638 is about 2053.9323260517. The cubic root of 4218638 is about 161.5811718335.

It can be divided in two parts, 42186 and 38, that added together give a palindrome (42224).

The spelling of 4218638 in words is "four million, two hundred eighteen thousand, six hundred thirty-eight".