438426772638 has 16 divisors (see below), whose sum is σ = 898240217616. Its totient is φ = 142577812160.

The previous prime is 438426772603. The next prime is 438426772661. The reversal of 438426772638 is 836277624834.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891111081 + ... + 891111572.

It is an arithmetic number, because the mean of its divisors is an integer number (56140013601).

Almost surely, 2^438426772638 is an apocalyptic number.

438426772638 is an abundant number, since it is smaller than the sum of its proper divisors (459813444978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

438426772638 is a wasteful number, since it uses less digits than its factorization.

438426772638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782222699.

The product of its digits is 65028096, while the sum is 60.

The spelling of 438426772638 in words is "four hundred thirty-eight billion, four hundred twenty-six million, seven hundred seventy-two thousand, six hundred thirty-eight".