218540156 has 12 divisors (see below), whose sum is σ = 382600680. Its totient is φ = 109225680.

The previous prime is 218540141. The next prime is 218540159. The reversal of 218540156 is 651045812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218540159) 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 3 ways as a sum of consecutive naturals, for example, 1586 + ... + 20966.

It is an arithmetic number, because the mean of its divisors is an integer number (31883390).

Almost surely, 2^218540156 is an apocalyptic number.

It is an amenable number.

218540156 is a deficient number, since it is larger than the sum of its proper divisors (164060524).

218540156 is a wasteful number, since it uses less digits than its factorization.

218540156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22204 (or 22202 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 218540156 is about 14783.1037336549. The cubic root of 218540156 is about 602.3428362531.

Adding to 218540156 its reverse (651045812), we get a palindrome (869585968).

The spelling of 218540156 in words is "two hundred eighteen million, five hundred forty thousand, one hundred fifty-six".