218493 has 12 divisors (see below), whose sum is σ = 344448. Its totient is φ = 132360.

The previous prime is 218479. The next prime is 218509. The reversal of 218493 is 394812.

It is not a de Polignac number, because 218493 - 2⁵ = 218461 is a prime.

218493 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218493.

It is not an unprimeable number, because it can be changed into a prime (218423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1005 + ... + 1202.

It is an arithmetic number, because the mean of its divisors is an integer number (28704).

2²¹⁸⁴⁹³ is an apocalyptic number.

It is an amenable number.

218493 is a deficient number, since it is larger than the sum of its proper divisors (125955).

218493 is a wasteful number, since it uses less digits than its factorization.

218493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224 (or 2221 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 218493 is about 467.4323480462. The cubic root of 218493 is about 60.2299509171.

The spelling of 218493 in words is "two hundred eighteen thousand, four hundred ninety-three".