305218 has 16 divisors (see below), whose sum is σ = 497664. Its totient is φ = 139840.

The previous prime is 305209. The next prime is 305219. The reversal of 305218 is 812503.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 305195 and 305204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (31104).

2³⁰⁵²¹⁸ is an apocalyptic number.

305218 is a deficient number, since it is larger than the sum of its proper divisors (192446).

305218 is a wasteful number, since it uses less digits than its factorization.

305218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 305218 is about 552.4653835310. The cubic root of 305218 is about 67.3291886044.

The spelling of 305218 in words is "three hundred five thousand, two hundred eighteen".