218086916 has 12 divisors (see below), whose sum is σ = 386880732. Its totient is φ = 107549568.

The previous prime is 218086903. The next prime is 218086919. The reversal of 218086916 is 619680812.

It can be written as a sum of positive squares in 2 ways, for example, as 61936900 + 156150016 = 7870^2 + 12496^2 .

It is not an unprimeable number, because it can be changed into a prime (218086919) 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 3 ways as a sum of consecutive naturals, for example, 373145 + ... + 373728.

It is an arithmetic number, because the mean of its divisors is an integer number (32240061).

Almost surely, 2^218086916 is an apocalyptic number.

It is an amenable number.

218086916 is a deficient number, since it is larger than the sum of its proper divisors (168793816).

218086916 is a wasteful number, since it uses less digits than its factorization.

218086916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746950 (or 746948 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 218086916 is about 14767.7661140743. The cubic root of 218086916 is about 601.9261396563.

The spelling of 218086916 in words is "two hundred eighteen million, eighty-six thousand, nine hundred sixteen".