438985 has 4 divisors (see below), whose sum is σ = 526788. Its totient is φ = 351184.

The previous prime is 438983. The next prime is 438989. The reversal of 438985 is 589834.

438985 = 205² + 206² + ... + 214².

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 219024 + 219961 = 468^2 + 469^2 .

It is a cyclic number.

It is not a de Polignac number, because 438985 - 2¹ = 438983 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438983) 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, 43894 + ... + 43903.

It is an arithmetic number, because the mean of its divisors is an integer number (131697).

438985 is a Friedman number, since it can be written as 9+((8+8)*5-4)^3, using all its digits and the basic arithmetic operations.

2⁴³⁸⁹⁸⁵ is an apocalyptic number.

438985 is the 469-th centered square number.

It is an amenable number.

438985 is a deficient number, since it is larger than the sum of its proper divisors (87803).

438985 is an equidigital number, since it uses as much as digits as its factorization.

438985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87802.

The product of its digits is 34560, while the sum is 37.

The square root of 438985 is about 662.5594312965. The cubic root of 438985 is about 76.0005193870. Note that the first 3 decimals are identical.

The spelling of 438985 in words is "four hundred thirty-eight thousand, nine hundred eighty-five".