318993 has 4 divisors (see below), whose sum is σ = 425328. Its totient is φ = 212660.

The previous prime is 318979. The next prime is 319001. The reversal of 318993 is 399813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399813 = 3 ⋅133271.

It is a cyclic number.

It is not a de Polignac number, because 318993 - 2⁸ = 318737 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (318793) 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, 53163 + ... + 53168.

It is an arithmetic number, because the mean of its divisors is an integer number (106332).

2³¹⁸⁹⁹³ is an apocalyptic number.

It is an amenable number.

318993 is a deficient number, since it is larger than the sum of its proper divisors (106335).

318993 is a wasteful number, since it uses less digits than its factorization.

318993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106334.

The product of its digits is 5832, while the sum is 33.

The square root of 318993 is about 564.7946529492. The cubic root of 318993 is about 68.3272147341.

The spelling of 318993 in words is "three hundred eighteen thousand, nine hundred ninety-three".