216889443 has 12 divisors (see below), whose sum is σ = 319951008. Its totient is φ = 141516240.

The previous prime is 216889411. The next prime is 216889447. The reversal of 216889443 is 344988612.

It is a happy number.

It is not a de Polignac number, because 216889443 - 2⁵ = 216889411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216889447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255948 + ... + 256793.

It is an arithmetic number, because the mean of its divisors is an integer number (26662584).

Almost surely, 2^216889443 is an apocalyptic number.

216889443 is a deficient number, since it is larger than the sum of its proper divisors (103061565).

216889443 is a wasteful number, since it uses less digits than its factorization.

216889443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512794 (or 512791 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 216889443 is about 14727.1668354779. The cubic root of 216889443 is about 600.8224304984.

The spelling of 216889443 in words is "two hundred sixteen million, eight hundred eighty-nine thousand, four hundred forty-three".