438605 has 4 divisors (see below), whose sum is σ = 526332. Its totient is φ = 350880.

The previous prime is 438601. The next prime is 438611. The reversal of 438605 is 506834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506834 = 2 ⋅253417.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 292681 = 382^2 + 541^2 .

It is not a de Polignac number, because 438605 - 2² = 438601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43856 + ... + 43865.

It is an arithmetic number, because the mean of its divisors is an integer number (131583).

2⁴³⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

438605 is a deficient number, since it is larger than the sum of its proper divisors (87727).

438605 is an equidigital number, since it uses as much as digits as its factorization.

438605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87726.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 438605 is about 662.2726024833. The cubic root of 438605 is about 75.9785835315.

The spelling of 438605 in words is "four hundred thirty-eight thousand, six hundred five".