218730012 has 12 divisors (see below), whose sum is σ = 510370056. Its totient is φ = 72910000.

The previous prime is 218729981. The next prime is 218730013. The reversal of 218730012 is 210037812.

218730012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218730013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9113739 + ... + 9113762.

It is an arithmetic number, because the mean of its divisors is an integer number (42530838).

Almost surely, 2^218730012 is an apocalyptic number.

It is an amenable number.

218730012 is an abundant number, since it is smaller than the sum of its proper divisors (291640044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218730012 is a wasteful number, since it uses less digits than its factorization.

218730012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18227508 (or 18227506 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 218730012 is about 14789.5237245829. The cubic root of 218730012 is about 602.5172135139.

Adding to 218730012 its reverse (210037812), we get a palindrome (428767824).

The spelling of 218730012 in words is "two hundred eighteen million, seven hundred thirty thousand, twelve".