4230721818 has 12 divisors (see below), whose sum is σ = 9166563978. Its totient is φ = 1410240600.

The previous prime is 4230721799. The next prime is 4230721819. The reversal of 4230721818 is 8181270324.

4230721818 is a `hidden beast` number, since 423 + 0 + 7 + 218 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3204352449 + 1026369369 = 56607^2 + 32037^2 .

It is not an unprimeable number, because it can be changed into a prime (4230721819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117520033 + ... + 117520068.

Almost surely, 2^4230721818 is an apocalyptic number.

4230721818 is an abundant number, since it is smaller than the sum of its proper divisors (4935842160).

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

4230721818 is a wasteful number, since it uses less digits than its factorization.

4230721818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235040109 (or 235040106 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 4230721818 is about 65043.9990929217. Note that the first 3 decimals coincide. The cubic root of 4230721818 is about 1617.3530184552.

The spelling of 4230721818 in words is "four billion, two hundred thirty million, seven hundred twenty-one thousand, eight hundred eighteen".