318840138 has 20 divisors (see below), whose sum is σ = 714438450. Its totient is φ = 106279992.

The previous prime is 318840113. The next prime is 318840139. The reversal of 318840138 is 831048813.

318840138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 302655609 + 16184529 = 17397^2 + 4023^2 .

It is not an unprimeable number, because it can be changed into a prime (318840139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 983913 + ... + 984236.

Almost surely, 2^318840138 is an apocalyptic number.

318840138 is an abundant number, since it is smaller than the sum of its proper divisors (395598312).

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

318840138 is a wasteful number, since it uses less digits than its factorization.

318840138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968163 (or 1968154 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 318840138 is about 17856.0952618427. The cubic root of 318840138 is about 683.1629881688.

It can be divided in two parts, 318 and 840138, that added together give a triangular number (840456 = T₁₂₉₆).

The spelling of 318840138 in words is "three hundred eighteen million, eight hundred forty thousand, one hundred thirty-eight".