216386814 has 32 divisors (see below), whose sum is σ = 495048960. Its totient is φ = 61768512.

The previous prime is 216386773. The next prime is 216386827. The reversal of 216386814 is 418683612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72157 + ... + 75095.

It is an arithmetic number, because the mean of its divisors is an integer number (15470280).

Almost surely, 2^216386814 is an apocalyptic number.

216386814 is an abundant number, since it is smaller than the sum of its proper divisors (278662146).

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

216386814 is a wasteful number, since it uses less digits than its factorization.

216386814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704.

The product of its digits is 55296, while the sum is 39.

The square root of 216386814 is about 14710.0922498807. The cubic root of 216386814 is about 600.3579475246.

The spelling of 216386814 in words is "two hundred sixteen million, three hundred eighty-six thousand, eight hundred fourteen".