438685 has 16 divisors (see below), whose sum is σ = 601776. Its totient is φ = 304128.

The previous prime is 438671. The next prime is 438701. The reversal of 438685 is 586834.

It can be written as a sum of positive squares in 8 ways, for example, as 441 + 438244 = 21^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 438685 - 2¹⁵ = 405917 is a prime.

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 438685.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (37611).

2⁴³⁸⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

438685 is a deficient number, since it is larger than the sum of its proper divisors (163091).

438685 is a wasteful number, since it uses less digits than its factorization.

438685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 23040, while the sum is 34.

The square root of 438685 is about 662.3329978191. The cubic root of 438685 is about 75.9832026590.

The spelling of 438685 in words is "four hundred thirty-eight thousand, six hundred eighty-five".