318909442 has 4 divisors (see below), whose sum is σ = 478364166. Its totient is φ = 159454720.

The previous prime is 318909389. The next prime is 318909463. The reversal of 318909442 is 244909813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 279859441 + 39050001 = 16729^2 + 6249^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 318909395 and 318909404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79727359 + ... + 79727362.

Almost surely, 2^318909442 is an apocalyptic number.

318909442 is a deficient number, since it is larger than the sum of its proper divisors (159454724).

318909442 is a wasteful number, since it uses less digits than its factorization.

318909442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159454723.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 318909442 is about 17858.0357822466. The cubic root of 318909442 is about 683.2124826669.

The spelling of 318909442 in words is "three hundred eighteen million, nine hundred nine thousand, four hundred forty-two".