216189807 has 8 divisors (see below), whose sum is σ = 288327984. Its totient is φ = 144089088.

The previous prime is 216189797. The next prime is 216189821. The reversal of 216189807 is 708981612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-216189807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216189887) 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 7 ways as a sum of consecutive naturals, for example, 9583 + ... + 22895.

It is an arithmetic number, because the mean of its divisors is an integer number (36040998).

Almost surely, 2^216189807 is an apocalyptic number.

216189807 is a deficient number, since it is larger than the sum of its proper divisors (72138177).

216189807 is a wasteful number, since it uses less digits than its factorization.

216189807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18729.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 216189807 is about 14703.3944040143. The cubic root of 216189807 is about 600.1756957689.

The spelling of 216189807 in words is "two hundred sixteen million, one hundred eighty-nine thousand, eight hundred seven".