318138 has 16 divisors (see below), whose sum is σ = 673920. Its totient is φ = 99776.

The previous prime is 318137. The next prime is 318161. The reversal of 318138 is 831813.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (318137) 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 7 ways as a sum of consecutive naturals, for example, 1458 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2³¹⁸¹³⁸ is an apocalyptic number.

318138 is an abundant number, since it is smaller than the sum of its proper divisors (355782).

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

318138 is a wasteful number, since it uses less digits than its factorization.

318138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141.

The product of its digits is 576, while the sum is 24.

The square root of 318138 is about 564.0372328136. The cubic root of 318138 is about 68.2661140821.

The spelling of 318138 in words is "three hundred eighteen thousand, one hundred thirty-eight".