7813938438 has 12 divisors (see below), whose sum is σ = 16930199988. Its totient is φ = 2604646140.

The previous prime is 7813938397. The next prime is 7813938521. The reversal of 7813938438 is 8348393187.

7813938438 is a `hidden beast` number, since 78 + 139 + 3 + 8 + 438 = 666.

It is a super-2 number, since 2×7813938438² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 217053828 + ... + 217053863.

It is an arithmetic number, because the mean of its divisors is an integer number (1410849999).

Almost surely, 2^7813938438 is an apocalyptic number.

7813938438 is an abundant number, since it is smaller than the sum of its proper divisors (9116261550).

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

7813938438 is a wasteful number, since it uses less digits than its factorization.

7813938438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434107699 (or 434107696 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 7813938438 is about 88396.4843079180. The cubic root of 7813938438 is about 1984.3730876467.

The spelling of 7813938438 in words is "seven billion, eight hundred thirteen million, nine hundred thirty-eight thousand, four hundred thirty-eight".