318821138 has 16 divisors (see below), whose sum is σ = 483533280. Its totient is φ = 157649856.

The previous prime is 318821089. The next prime is 318821161. The reversal of 318821138 is 831128813.

It is a junction number, because it is equal to n+sod(n) for n = 318821098 and 318821107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122333 + ... + 124911.

It is an arithmetic number, because the mean of its divisors is an integer number (30220830).

Almost surely, 2^318821138 is an apocalyptic number.

318821138 is a deficient number, since it is larger than the sum of its proper divisors (164712142).

318821138 is a wasteful number, since it uses less digits than its factorization.

318821138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241.

The product of its digits is 9216, while the sum is 35.

The square root of 318821138 is about 17855.5632227046. The cubic root of 318821138 is about 683.1494177793.

The spelling of 318821138 in words is "three hundred eighteen million, eight hundred twenty-one thousand, one hundred thirty-eight".