216123918 has 8 divisors (see below), whose sum is σ = 432247848. Its totient is φ = 72041304.

The previous prime is 216123911. The next prime is 216123923. The reversal of 216123918 is 819321612.

It is a sphenic number, since it is the product of 3 distinct primes.

216123918 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216123911) 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, 18010321 + ... + 18010332.

It is an arithmetic number, because the mean of its divisors is an integer number (54030981).

Almost surely, 2^216123918 is an apocalyptic number.

216123918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216123918 is a wasteful number, since it uses less digits than its factorization.

216123918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36020658.

The product of its digits is 5184, while the sum is 33.

The square root of 216123918 is about 14701.1536282021. The cubic root of 216123918 is about 600.1147169542.

The spelling of 216123918 in words is "two hundred sixteen million, one hundred twenty-three thousand, nine hundred eighteen".