218208243 has 16 divisors (see below), whose sum is σ = 336064896. Its totient is φ = 124467840.

The previous prime is 218208233. The next prime is 218208247. The reversal of 218208243 is 342802812.

It is not a de Polignac number, because 218208243 - 2¹⁴ = 218191859 is a prime.

It is a super-2 number, since 2×218208243² = 95229674626294098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218208243.

It is not an unprimeable number, because it can be changed into a prime (218208247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193921 + ... + 195042.

It is an arithmetic number, because the mean of its divisors is an integer number (21004056).

Almost surely, 2^218208243 is an apocalyptic number.

218208243 is a deficient number, since it is larger than the sum of its proper divisors (117856653).

218208243 is a wasteful number, since it uses less digits than its factorization.

218208243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388994.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 218208243 is about 14771.8733747619. The cubic root of 218208243 is about 602.0377409627.

The spelling of 218208243 in words is "two hundred eighteen million, two hundred eight thousand, two hundred forty-three".