318445 has 4 divisors (see below), whose sum is σ = 382140. Its totient is φ = 254752.

The previous prime is 318443. The next prime is 318457. The reversal of 318445 is 544813.

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

It can be written as a sum of positive squares in 2 ways, for example, as 142884 + 175561 = 378^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 318445 - 2¹ = 318443 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318443) 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 3 ways as a sum of consecutive naturals, for example, 31840 + ... + 31849.

It is an arithmetic number, because the mean of its divisors is an integer number (95535).

2³¹⁸⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

318445 is a deficient number, since it is larger than the sum of its proper divisors (63695).

318445 is an equidigital number, since it uses as much as digits as its factorization.

318445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63694.

The product of its digits is 1920, while the sum is 25.

The square root of 318445 is about 564.3093123456. The cubic root of 318445 is about 68.2880657292.

The spelling of 318445 in words is "three hundred eighteen thousand, four hundred forty-five".