438907235681 has 4 divisors (see below), whose sum is σ = 448245687552. Its totient is φ = 429568783812.

The previous prime is 438907235671. The next prime is 438907235699. The reversal of 438907235681 is 186532709834.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 438907235681 - 2¹⁰ = 438907234657 is a prime.

It is a super-2 number, since 2×438907235681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438907235671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4669225865 + ... + 4669225958.

It is an arithmetic number, because the mean of its divisors is an integer number (112061421888).

It is a 1-persistent number, because it is pandigital, but 2⋅438907235681 = 877814471362 is not.

Almost surely, 2^438907235681 is an apocalyptic number.

It is an amenable number.

438907235681 is a deficient number, since it is larger than the sum of its proper divisors (9338451871).

438907235681 is an equidigital number, since it uses as much as digits as its factorization.

438907235681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9338451870.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 438907235681 in words is "four hundred thirty-eight billion, nine hundred seven million, two hundred thirty-five thousand, six hundred eighty-one".