318947 has 4 divisors (see below), whose sum is σ = 320280. Its totient is φ = 317616.

The previous prime is 318919. The next prime is 318949. The reversal of 318947 is 749813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749813 = 263 ⋅2851.

It is a cyclic number.

It is not a de Polignac number, because 318947 - 2⁶ = 318883 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 318947.

It is not an unprimeable number, because it can be changed into a prime (318949) 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, 197 + ... + 822.

It is an arithmetic number, because the mean of its divisors is an integer number (80070).

2³¹⁸⁹⁴⁷ is an apocalyptic number.

318947 is a deficient number, since it is larger than the sum of its proper divisors (1333).

318947 is a wasteful number, since it uses less digits than its factorization.

318947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332.

The product of its digits is 6048, while the sum is 32.

The square root of 318947 is about 564.7539287159. The cubic root of 318947 is about 68.3239302284.

The spelling of 318947 in words is "three hundred eighteen thousand, nine hundred forty-seven".