318516138 has 28 divisors (see below), whose sum is σ = 716336898. Its totient is φ = 106171560.

The previous prime is 318516113. The next prime is 318516139. The reversal of 318516138 is 831615813.

318516138 is a `hidden beast` number, since 3 + 1 + 8 + 516 + 138 = 666.

It can be written as a sum of positive squares in only one way, i.e., 318515409 + 729 = 17847^2 + 27^2 .

It is not an unprimeable number, because it can be changed into a prime (318516139) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 107773 + ... + 110688.

Almost surely, 2^318516138 is an apocalyptic number.

318516138 is an abundant number, since it is smaller than the sum of its proper divisors (397820760).

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

318516138 is an equidigital number, since it uses as much as digits as its factorization.

318516138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218481 (or 218466 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 318516138 is about 17847.0204235889. The cubic root of 318516138 is about 682.9315034845.

The spelling of 318516138 in words is "three hundred eighteen million, five hundred sixteen thousand, one hundred thirty-eight".