216836394 has 16 divisors (see below), whose sum is σ = 459183168. Its totient is φ = 68027072.

The previous prime is 216836381. The next prime is 216836437. The reversal of 216836394 is 493638612.

216836394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062822 + ... + 1063025.

It is an arithmetic number, because the mean of its divisors is an integer number (28698948).

Almost surely, 2^216836394 is an apocalyptic number.

216836394 is an abundant number, since it is smaller than the sum of its proper divisors (242346774).

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

216836394 is a wasteful number, since it uses less digits than its factorization.

216836394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125869.

The product of its digits is 186624, while the sum is 42.

The square root of 216836394 is about 14725.3656660879. The cubic root of 216836394 is about 600.7734414410.

The spelling of 216836394 in words is "two hundred sixteen million, eight hundred thirty-six thousand, three hundred ninety-four".