438981138964 has 12 divisors (see below), whose sum is σ = 768224769844. Its totient is φ = 219488347584.

The previous prime is 438981138917. The next prime is 438981139007. The reversal of 438981138964 is 469831189834.

It can be written as a sum of positive squares in 2 ways, for example, as 402262914564 + 36718224400 = 634242^2 + 191620^2 .

It is a super-2 number, since 2×438981138964² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 438981138896 and 438981138905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62289 + ... + 939064.

Almost surely, 2^438981138964 is an apocalyptic number.

It is an amenable number.

438981138964 is a deficient number, since it is larger than the sum of its proper divisors (329243630880).

438981138964 is a wasteful number, since it uses less digits than its factorization.

438981138964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110954 (or 1110952 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 64.

The spelling of 438981138964 in words is "four hundred thirty-eight billion, nine hundred eighty-one million, one hundred thirty-eight thousand, nine hundred sixty-four".