216947373 has 4 divisors (see below), whose sum is σ = 289263168. Its totient is φ = 144631580.

The previous prime is 216947333. The next prime is 216947389. The reversal of 216947373 is 373749612.

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 216947373 - 2¹³ = 216939181 is a prime.

It is a super-3 number, since 3×216947373³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216947303) 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, 36157893 + ... + 36157898.

It is an arithmetic number, because the mean of its divisors is an integer number (72315792).

Almost surely, 2^216947373 is an apocalyptic number.

It is an amenable number.

216947373 is a deficient number, since it is larger than the sum of its proper divisors (72315795).

216947373 is an equidigital number, since it uses as much as digits as its factorization.

216947373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72315794.

The product of its digits is 190512, while the sum is 42.

The square root of 216947373 is about 14729.1334775675. The cubic root of 216947373 is about 600.8759178797.

The spelling of 216947373 in words is "two hundred sixteen million, nine hundred forty-seven thousand, three hundred seventy-three".