216144439 has 12 divisors (see below), whose sum is σ = 251985600. Its totient is φ = 184859808.

The previous prime is 216144419. The next prime is 216144463. The reversal of 216144439 is 934441612.

216144439 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 216144439 - 2¹¹ = 216142391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216144419) 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, 18867 + ... + 28075.

It is an arithmetic number, because the mean of its divisors is an integer number (20998800).

Almost surely, 2^216144439 is an apocalyptic number.

216144439 is a deficient number, since it is larger than the sum of its proper divisors (35841161).

216144439 is an equidigital number, since it uses as much as digits as its factorization.

216144439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9702 (or 9695 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 216144439 is about 14701.8515500599. The cubic root of 216144439 is about 600.1337100153.

The spelling of 216144439 in words is "two hundred sixteen million, one hundred forty-four thousand, four hundred thirty-nine".