438505 has 4 divisors (see below), whose sum is σ = 526212. Its totient is φ = 350800.

The previous prime is 438499. The next prime is 438517. The reversal of 438505 is 505834.

It is a happy number.

438505 is nontrivially palindromic in base 4 and base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 120409 = 564^2 + 347^2 .

It is not a de Polignac number, because 438505 - 2⁷ = 438377 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 438505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43846 + ... + 43855.

It is an arithmetic number, because the mean of its divisors is an integer number (131553).

2⁴³⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

438505 is a deficient number, since it is larger than the sum of its proper divisors (87707).

438505 is an equidigital number, since it uses as much as digits as its factorization.

438505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87706.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 438505 is about 662.1971005675. The cubic root of 438505 is about 75.9728088323.

The spelling of 438505 in words is "four hundred thirty-eight thousand, five hundred five".