393218 has 8 divisors (see below), whose sum is σ = 674112. Its totient is φ = 168516.

The previous prime is 393209. The next prime is 393241. The reversal of 393218 is 812393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14030 + ... + 14057.

It is an arithmetic number, because the mean of its divisors is an integer number (84264).

393218 is a Friedman number, since it can be written as 2+(9-3)*(3+1)^8, using all its digits and the basic arithmetic operations.

2³⁹³²¹⁸ is an apocalyptic number.

393218 is a deficient number, since it is larger than the sum of its proper divisors (280894).

393218 is a wasteful number, since it uses less digits than its factorization.

393218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28096.

The product of its digits is 1296, while the sum is 26.

The square root of 393218 is about 627.0709688704. The cubic root of 393218 is about 73.2618357326.

The spelling of 393218 in words is "three hundred ninety-three thousand, two hundred eighteen".