218069812 has 12 divisors (see below), whose sum is σ = 404070660. Its totient is φ = 102621056.

The previous prime is 218069809. The next prime is 218069827. The reversal of 218069812 is 218960812.

It can be written as a sum of positive squares in 2 ways, for example, as 202037796 + 16032016 = 14214^2 + 4004^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603387 + ... + 1603522.

It is an arithmetic number, because the mean of its divisors is an integer number (33672555).

Almost surely, 2^218069812 is an apocalyptic number.

It is an amenable number.

218069812 is a deficient number, since it is larger than the sum of its proper divisors (186000848).

218069812 is a wasteful number, since it uses less digits than its factorization.

218069812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206930 (or 3206928 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 218069812 is about 14767.1870036239. The cubic root of 218069812 is about 601.9104034015.

The spelling of 218069812 in words is "two hundred eighteen million, sixty-nine thousand, eight hundred twelve".