218342285 has 24 divisors (see below), whose sum is σ = 307159776. Its totient is φ = 148555680.

The previous prime is 218342239. The next prime is 218342287. The reversal of 218342285 is 582243812.

It is not a de Polignac number, because 218342285 - 2⁸ = 218342029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218342287) 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 23 ways as a sum of consecutive naturals, for example, 28694 + ... + 35496.

It is an arithmetic number, because the mean of its divisors is an integer number (12798324).

Almost surely, 2^218342285 is an apocalyptic number.

It is an amenable number.

218342285 is a deficient number, since it is larger than the sum of its proper divisors (88817491).

218342285 is a wasteful number, since it uses less digits than its factorization.

218342285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953 (or 6946 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 218342285 is about 14776.4097466198. The cubic root of 218342285 is about 602.1609899342.

The spelling of 218342285 in words is "two hundred eighteen million, three hundred forty-two thousand, two hundred eighty-five".