218900185 has 8 divisors (see below), whose sum is σ = 300206016. Its totient is φ = 150102960.

The previous prime is 218900173. The next prime is 218900219. The reversal of 218900185 is 581009812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218900185 - 2⁵ = 218900153 is a prime.

It is a super-4 number, since 4×218900185⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218900185.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3127111 + ... + 3127180.

It is an arithmetic number, because the mean of its divisors is an integer number (37525752).

Almost surely, 2^218900185 is an apocalyptic number.

It is an amenable number.

218900185 is a deficient number, since it is larger than the sum of its proper divisors (81305831).

218900185 is an equidigital number, since it uses as much as digits as its factorization.

218900185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6254303.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 218900185 is about 14795.2757662708. The cubic root of 218900185 is about 602.6734267715.

Adding to 218900185 its reverse (581009812), we get a palindrome (799909997).

The spelling of 218900185 in words is "two hundred eighteen million, nine hundred thousand, one hundred eighty-five".