438688385 has 8 divisors (see below), whose sum is σ = 530269416. Its totient is φ = 348388480.

The previous prime is 438688381. The next prime is 438688399. The reversal of 438688385 is 583886834.

It can be written as a sum of positive squares in 4 ways, for example, as 37249 + 438651136 = 193^2 + 20944^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 438688385 - 2² = 438688381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438688381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319526 + ... + 320895.

It is an arithmetic number, because the mean of its divisors is an integer number (66283677).

Almost surely, 2^438688385 is an apocalyptic number.

It is an amenable number.

438688385 is a deficient number, since it is larger than the sum of its proper divisors (91581031).

438688385 is a wasteful number, since it uses less digits than its factorization.

438688385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640563.

The product of its digits is 4423680, while the sum is 53.

The square root of 438688385 is about 20944.8892334144. The cubic root of 438688385 is about 759.8339809340.

The spelling of 438688385 in words is "four hundred thirty-eight million, six hundred eighty-eight thousand, three hundred eighty-five".