218478 has 16 divisors (see below), whose sum is σ = 470736. Its totient is φ = 67200.

The previous prime is 218461. The next prime is 218479. The reversal of 218478 is 874812.

218478 is nontrivially palindromic in base 7.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218479) by changing a digit.

218478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (29421).

2²¹⁸⁴⁷⁸ is an apocalyptic number.

218478 is an abundant number, since it is smaller than the sum of its proper divisors (252258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218478 is a wasteful number, since it uses less digits than its factorization.

218478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819.

The product of its digits is 3584, while the sum is 30.

The square root of 218478 is about 467.4163026682. The cubic root of 218478 is about 60.2285725816.

It can be divided in two parts, 218 and 478, that added together give a palindrome (696).

The spelling of 218478 in words is "two hundred eighteen thousand, four hundred seventy-eight".