218643836 has 12 divisors (see below), whose sum is σ = 383397000. Its totient is φ = 109101840.

The previous prime is 218643827. The next prime is 218643853. The reversal of 218643836 is 638346812.

It is a happy number.

218643836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 218643793 and 218643802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52775 + ... + 56766.

It is an arithmetic number, because the mean of its divisors is an integer number (31949750).

Almost surely, 2^218643836 is an apocalyptic number.

It is an amenable number.

218643836 is a deficient number, since it is larger than the sum of its proper divisors (164753164).

218643836 is a wasteful number, since it uses less digits than its factorization.

218643836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110044 (or 110042 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 218643836 is about 14786.6100239372. The cubic root of 218643836 is about 602.4380758542.

The spelling of 218643836 in words is "two hundred eighteen million, six hundred forty-three thousand, eight hundred thirty-six".