216393936 has 160 divisors (see below), whose sum is σ = 646244352. Its totient is φ = 61754880.

The previous prime is 216393929. The next prime is 216393937. The reversal of 216393936 is 639393612.

216393936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216393937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1250746 + ... + 1250918.

Almost surely, 2^216393936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216393936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323122176).

216393936 is an abundant number, since it is smaller than the sum of its proper divisors (429850416).

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

216393936 is a wasteful number, since it uses less digits than its factorization.

216393936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 315 counting only the distinct ones).

The product of its digits is 157464, while the sum is 42.

The square root of 216393936 is about 14710.3343265882. The cubic root of 216393936 is about 600.3645340356.

The spelling of 216393936 in words is "two hundred sixteen million, three hundred ninety-three thousand, nine hundred thirty-six".