438618 has 16 divisors (see below), whose sum is σ = 899136. Its totient is φ = 142560.

The previous prime is 438611. The next prime is 438623. The reversal of 438618 is 816834.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (438611) by changing a digit.

438618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (56196).

2⁴³⁸⁶¹⁸ is an apocalyptic number.

438618 is an abundant number, since it is smaller than the sum of its proper divisors (460518).

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

438618 is a wasteful number, since it uses less digits than its factorization.

438618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829.

The product of its digits is 4608, while the sum is 30.

The square root of 438618 is about 662.2824171001. The cubic root of 438618 is about 75.9793341779.

The spelling of 438618 in words is "four hundred thirty-eight thousand, six hundred eighteen".