438906711205 has 4 divisors (see below), whose sum is σ = 526688053452. Its totient is φ = 351125368960.

The previous prime is 438906711203. The next prime is 438906711223. The reversal of 438906711205 is 502117609834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502117609834 = 2 ⋅251058804917.

It can be written as a sum of positive squares in 2 ways, for example, as 112601855844 + 326304855361 = 335562^2 + 571231^2 .

It is not a de Polignac number, because 438906711205 - 2¹ = 438906711203 is a prime.

It is a super-2 number, since 2×438906711205² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438906711203) 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, 43890671116 + ... + 43890671125.

It is an arithmetic number, because the mean of its divisors is an integer number (131672013363).

It is a 1-persistent number, because it is pandigital, but 2⋅438906711205 = 877813422410 is not.

Almost surely, 2^438906711205 is an apocalyptic number.

It is an amenable number.

438906711205 is a deficient number, since it is larger than the sum of its proper divisors (87781342247).

438906711205 is an equidigital number, since it uses as much as digits as its factorization.

438906711205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87781342246.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 438906711205 in words is "four hundred thirty-eight billion, nine hundred six million, seven hundred eleven thousand, two hundred five".