216538893 has 8 divisors (see below), whose sum is σ = 320798400. Its totient is φ = 144359244.

The previous prime is 216538891. The next prime is 216538901. The reversal of 216538893 is 398835612.

It is a happy number.

216538893 is a `hidden beast` number, since 21 + 6 + 538 + 8 + 93 = 666.

216538893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216538893 - 2¹ = 216538891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216538891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4009953 + ... + 4010006.

It is an arithmetic number, because the mean of its divisors is an integer number (40099800).

Almost surely, 2^216538893 is an apocalyptic number.

It is an amenable number.

216538893 is a deficient number, since it is larger than the sum of its proper divisors (104259507).

216538893 is an equidigital number, since it uses as much as digits as its factorization.

216538893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8019968 (or 8019962 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 216538893 is about 14715.2605481520. The cubic root of 216538893 is about 600.4985606141.

The spelling of 216538893 in words is "two hundred sixteen million, five hundred thirty-eight thousand, eight hundred ninety-three".