216430189 has 4 divisors (see below), whose sum is σ = 223411840. Its totient is φ = 209448540.

The previous prime is 216430171. The next prime is 216430241. The reversal of 216430189 is 981034612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216430189 - 2⁵ = 216430157 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 (216430139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3490779 + ... + 3490840.

It is an arithmetic number, because the mean of its divisors is an integer number (55852960).

Almost surely, 2^216430189 is an apocalyptic number.

It is an amenable number.

216430189 is a deficient number, since it is larger than the sum of its proper divisors (6981651).

216430189 is an equidigital number, since it uses as much as digits as its factorization.

216430189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6981650.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 216430189 is about 14711.5665039451. The cubic root of 216430189 is about 600.3980590048.

The spelling of 216430189 in words is "two hundred sixteen million, four hundred thirty thousand, one hundred eighty-nine".