438918538 has 16 divisors (see below), whose sum is σ = 685665000. Its totient is φ = 210465472.

The previous prime is 438918533. The next prime is 438918551. The reversal of 438918538 is 835819834.

It can be written as a sum of positive squares in 4 ways, for example, as 174953529 + 263965009 = 13227^2 + 16247^2 .

It is a junction number, because it is equal to n+sod(n) for n = 438918491 and 438918500.

It is not an unprimeable number, because it can be changed into a prime (438918533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16753 + ... + 34036.

Almost surely, 2^438918538 is an apocalyptic number.

438918538 is a deficient number, since it is larger than the sum of its proper divisors (246746462).

438918538 is a wasteful number, since it uses less digits than its factorization.

438918538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50969.

The product of its digits is 829440, while the sum is 49.

The square root of 438918538 is about 20950.3827649998. The cubic root of 438918538 is about 759.9668371956.

The spelling of 438918538 in words is "four hundred thirty-eight million, nine hundred eighteen thousand, five hundred thirty-eight".