7381138518 has 48 divisors (see below), whose sum is σ = 17971480800. Its totient is φ = 2172373632.

The previous prime is 7381138511. The next prime is 7381138543. The reversal of 7381138518 is 8158311837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7381138511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 680343 + ... + 691106.

It is an arithmetic number, because the mean of its divisors is an integer number (374405850).

Almost surely, 2^7381138518 is an apocalyptic number.

7381138518 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

7381138518 is an abundant number, since it is smaller than the sum of its proper divisors (10590342282).

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

7381138518 is a wasteful number, since it uses less digits than its factorization.

7381138518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371493 (or 1371490 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 7381138518 is about 85913.5525863062. The cubic root of 7381138518 is about 1947.0381085337.

The spelling of 7381138518 in words is "seven billion, three hundred eighty-one million, one hundred thirty-eight thousand, five hundred eighteen".