216469 has 6 divisors (see below), whose sum is σ = 238070. Its totient is φ = 196680.

The previous prime is 216451. The next prime is 216481. The reversal of 216469 is 964612.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 3025 = 462^2 + 55^2 .

It is not a de Polignac number, because 216469 - 2¹³ = 208277 is a prime.

It is a super-2 number, since 2×216469² = 93717655922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 774 + ... + 1015.

2²¹⁶⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

216469 is a deficient number, since it is larger than the sum of its proper divisors (21601).

216469 is a wasteful number, since it uses less digits than its factorization.

216469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811 (or 1800 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 216469 is about 465.2622916162. The cubic root of 216469 is about 60.0433945336.

It can be divided in two parts, 2 and 16469, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 216469 in words is "two hundred sixteen thousand, four hundred sixty-nine".