318591940 has 12 divisors (see below), whose sum is σ = 669043116. Its totient is φ = 127436768.

The previous prime is 318591887. The next prime is 318591947. The reversal of 318591940 is 49195813.

It can be written as a sum of positive squares in 2 ways, for example, as 98128836 + 220463104 = 9906^2 + 14848^2 .

It is a junction number, because it is equal to n+sod(n) for n = 318591893 and 318591902.

It is not an unprimeable number, because it can be changed into a prime (318591947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7964779 + ... + 7964818.

It is an arithmetic number, because the mean of its divisors is an integer number (55753593).

Almost surely, 2^318591940 is an apocalyptic number.

It is an amenable number.

318591940 is an abundant number, since it is smaller than the sum of its proper divisors (350451176).

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

318591940 is a wasteful number, since it uses less digits than its factorization.

318591940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15929606 (or 15929604 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 318591940 is about 17849.1439570642. The cubic root of 318591940 is about 682.9856749602.

The spelling of 318591940 in words is "three hundred eighteen million, five hundred ninety-one thousand, nine hundred forty".