218434 has 8 divisors (see below), whose sum is σ = 330300. Its totient is φ = 108336.

The previous prime is 218423. The next prime is 218437. The reversal of 218434 is 434812.

218434 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 216225 + 2209 = 465^2 + 47^2 .

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

It is not an unprimeable number, because it can be changed into a prime (218437) 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, 69 + ... + 664.

2²¹⁸⁴³⁴ is an apocalyptic number.

218434 is a deficient number, since it is larger than the sum of its proper divisors (111866).

218434 is a wasteful number, since it uses less digits than its factorization.

218434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its digits is 768, while the sum is 22.

The square root of 218434 is about 467.3692330481. The cubic root of 218434 is about 60.2245291003.

The spelling of 218434 in words is "two hundred eighteen thousand, four hundred thirty-four".