216247 has 8 divisors (see below), whose sum is σ = 228096. Its totient is φ = 204792.

The previous prime is 216233. The next prime is 216259. The reversal of 216247 is 742612.

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

It is a cyclic number.

It is not a de Polignac number, because 216247 - 2⁷ = 216119 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 (216217) 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, 1968 + ... + 2074.

It is an arithmetic number, because the mean of its divisors is an integer number (28512).

2²¹⁶²⁴⁷ is an apocalyptic number.

216247 is a deficient number, since it is larger than the sum of its proper divisors (11849).

216247 is a wasteful number, since it uses less digits than its factorization.

216247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197.

The product of its digits is 672, while the sum is 22.

The square root of 216247 is about 465.0236553123. The cubic root of 216247 is about 60.0228616583.

Subtracting from 216247 its sum of digits (22), we obtain a square (216225 = 465²).

Adding to 216247 its reverse (742612), we get a palindrome (958859).

It can be divided in two parts, 2162 and 47, that added together give a square (2209 = 47²).

The spelling of 216247 in words is "two hundred sixteen thousand, two hundred forty-seven".