7738404138 has 48 divisors (see below), whose sum is σ = 17506925280. Its totient is φ = 2467227168.

The previous prime is 7738404137. The next prime is 7738404161. The reversal of 7738404138 is 8314048377.

It is a junction number, because it is equal to n+sod(n) for n = 7738404093 and 7738404102.

It is not an unprimeable number, because it can be changed into a prime (7738404133) 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 23 ways as a sum of consecutive naturals, for example, 13420 + ... + 125127.

It is an arithmetic number, because the mean of its divisors is an integer number (364727610).

Almost surely, 2^7738404138 is an apocalyptic number.

7738404138 is an abundant number, since it is smaller than the sum of its proper divisors (9768521142).

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

7738404138 is a wasteful number, since it uses less digits than its factorization.

7738404138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138691 (or 138688 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 7738404138 is about 87968.1995837132. The cubic root of 7738404138 is about 1977.9583193772.

The spelling of 7738404138 in words is "seven billion, seven hundred thirty-eight million, four hundred four thousand, one hundred thirty-eight".