318505638 has 32 divisors (see below), whose sum is σ = 700682112. Its totient is φ = 96514440.

The previous prime is 318505631. The next prime is 318505651. The reversal of 318505638 is 836505813.

It is a junction number, because it is equal to n+sod(n) for n = 318505596 and 318505605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318505631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11956 + ... + 27927.

It is an arithmetic number, because the mean of its divisors is an integer number (21896316).

Almost surely, 2^318505638 is an apocalyptic number.

318505638 is an abundant number, since it is smaller than the sum of its proper divisors (382176474).

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

318505638 is a wasteful number, since it uses less digits than its factorization.

318505638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39921 (or 39899 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 318505638 is about 17846.7262544143. The cubic root of 318505638 is about 682.9239990404.

The spelling of 318505638 in words is "three hundred eighteen million, five hundred five thousand, six hundred thirty-eight".