218473 has 4 divisors (see below), whose sum is σ = 219780. Its totient is φ = 217168.

The previous prime is 218461. The next prime is 218479. The reversal of 218473 is 374812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107584 + 110889 = 328^2 + 333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218473 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (218479) 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, 358 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (54945).

2²¹⁸⁴⁷³ is an apocalyptic number.

It is an amenable number.

218473 is a deficient number, since it is larger than the sum of its proper divisors (1307).

218473 is a wasteful number, since it uses less digits than its factorization.

218473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306.

The product of its digits is 1344, while the sum is 25.

The square root of 218473 is about 467.4109540864. The cubic root of 218473 is about 60.2281131225.

The spelling of 218473 in words is "two hundred eighteen thousand, four hundred seventy-three".