216400324 has 24 divisors (see below), whose sum is σ = 438733568. Its totient is φ = 91471680.

The previous prime is 216400321. The next prime is 216400351. The reversal of 216400324 is 423004612.

It is a happy number.

216400324 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

216400324 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 216400295 and 216400304.

It is not an unprimeable number, because it can be changed into a prime (216400321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50892 + ... + 54979.

Almost surely, 2^216400324 is an apocalyptic number.

It is an amenable number.

216400324 is an abundant number, since it is smaller than the sum of its proper divisors (222333244).

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

216400324 is a wasteful number, since it uses less digits than its factorization.

216400324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105955 (or 105953 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 216400324 is about 14710.5514512543. The cubic root of 216400324 is about 600.3704416117.

Adding to 216400324 its reverse (423004612), we get a palindrome (639404936).

The spelling of 216400324 in words is "two hundred sixteen million, four hundred thousand, three hundred twenty-four".