218542873 has 4 divisors (see below), whose sum is σ = 218574720. Its totient is φ = 218511028.

The previous prime is 218542861. The next prime is 218542943. The reversal of 218542873 is 378245812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 218542873 - 2¹³ = 218534681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218542853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913 + ... + 20926.

It is an arithmetic number, because the mean of its divisors is an integer number (54643680).

Almost surely, 2^218542873 is an apocalyptic number.

It is an amenable number.

218542873 is a deficient number, since it is larger than the sum of its proper divisors (31847).

218542873 is a wasteful number, since it uses less digits than its factorization.

218542873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31846.

The product of its digits is 107520, while the sum is 40.

The square root of 218542873 is about 14783.1956288213. The cubic root of 218542873 is about 602.3453324514.

The spelling of 218542873 in words is "two hundred eighteen million, five hundred forty-two thousand, eight hundred seventy-three".