218358873 has 6 divisors (see below), whose sum is σ = 315407274. Its totient is φ = 145572576.

The previous prime is 218358821. The next prime is 218358901. The reversal of 218358873 is 378853812.

218358873 is a `hidden beast` number, since 218 + 358 + 87 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 217769049 + 589824 = 14757^2 + 768^2 .

It is not a de Polignac number, because 218358873 - 2⁶ = 218358809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218359873) 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 5 ways as a sum of consecutive naturals, for example, 12131040 + ... + 12131057.

It is an arithmetic number, because the mean of its divisors is an integer number (52567879).

Almost surely, 2^218358873 is an apocalyptic number.

It is an amenable number.

218358873 is a deficient number, since it is larger than the sum of its proper divisors (97048401).

218358873 is a wasteful number, since it uses less digits than its factorization.

218358873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24262103 (or 24262100 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 218358873 is about 14776.9710360412. The cubic root of 218358873 is about 602.1762387648.

The spelling of 218358873 in words is "two hundred eighteen million, three hundred fifty-eight thousand, eight hundred seventy-three".