216487 has 4 divisors (see below), whose sum is σ = 222376. Its totient is φ = 210600.

The previous prime is 216481. The next prime is 216493. The reversal of 216487 is 784612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (216481) and next prime (216493).

It is a cyclic number.

It is not a de Polignac number, because 216487 - 2¹¹ = 214439 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 (216481) 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 3 ways as a sum of consecutive naturals, for example, 2889 + ... + 2962.

It is an arithmetic number, because the mean of its divisors is an integer number (55594).

2²¹⁶⁴⁸⁷ is an apocalyptic number.

216487 is a deficient number, since it is larger than the sum of its proper divisors (5889).

216487 is an equidigital number, since it uses as much as digits as its factorization.

216487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5888.

The product of its digits is 2688, while the sum is 28.

The square root of 216487 is about 465.2816351416. The cubic root of 216487 is about 60.0450587459.

It can be divided in two parts, 216 and 487, that added together give a triangular number (703 = T₃₇).

The spelling of 216487 in words is "two hundred sixteen thousand, four hundred eighty-seven".