216814918 has 4 divisors (see below), whose sum is σ = 325222380. Its totient is φ = 108407458.

The previous prime is 216814883. The next prime is 216814919. The reversal of 216814918 is 819418612.

216814918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216814919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54203728 + ... + 54203731.

It is an arithmetic number, because the mean of its divisors is an integer number (81305595).

Almost surely, 2^216814918 is an apocalyptic number.

216814918 is a deficient number, since it is larger than the sum of its proper divisors (108407462).

216814918 is a wasteful number, since it uses less digits than its factorization.

216814918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108407461.

The product of its digits is 27648, while the sum is 40.

The square root of 216814918 is about 14724.6364301466. The cubic root of 216814918 is about 600.7536067688.

The spelling of 216814918 in words is "two hundred sixteen million, eight hundred fourteen thousand, nine hundred eighteen".