216398545 has 8 divisors (see below), whose sum is σ = 283285440. Its totient is φ = 157380720.

The previous prime is 216398521. The next prime is 216398549. The reversal of 216398545 is 545893612.

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

It is not a de Polignac number, because 216398545 - 2⁹ = 216398033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216398549) 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, 1967205 + ... + 1967314.

It is an arithmetic number, because the mean of its divisors is an integer number (35410680).

Almost surely, 2^216398545 is an apocalyptic number.

It is an amenable number.

216398545 is a deficient number, since it is larger than the sum of its proper divisors (66886895).

216398545 is a wasteful number, since it uses less digits than its factorization.

216398545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934535.

The product of its digits is 259200, while the sum is 43.

The square root of 216398545 is about 14710.4909843282. The cubic root of 216398545 is about 600.3687964170.

The spelling of 216398545 in words is "two hundred sixteen million, three hundred ninety-eight thousand, five hundred forty-five".