216015918 has 16 divisors (see below), whose sum is σ = 442079616. Its totient is φ = 70330680.

The previous prime is 216015911. The next prime is 216015937. The reversal of 216015918 is 819510612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216015911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418378 + ... + 418893.

It is an arithmetic number, because the mean of its divisors is an integer number (27629976).

Almost surely, 2^216015918 is an apocalyptic number.

216015918 is an abundant number, since it is smaller than the sum of its proper divisors (226063698).

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

216015918 is a wasteful number, since it uses less digits than its factorization.

216015918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837319.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 216015918 is about 14697.4799880796. The cubic root of 216015918 is about 600.0147385268.

The spelling of 216015918 in words is "two hundred sixteen million, fifteen thousand, nine hundred eighteen".