216429 has 8 divisors (see below), whose sum is σ = 303840. Its totient is φ = 136656.

The previous prime is 216421. The next prime is 216431. The reversal of 216429 is 924612.

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

It is not a de Polignac number, because 216429 - 2³ = 216421 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 216399 and 216408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216421) 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, 1842 + ... + 1955.

It is an arithmetic number, because the mean of its divisors is an integer number (37980).

2²¹⁶⁴²⁹ is an apocalyptic number.

It is an amenable number.

216429 is a deficient number, since it is larger than the sum of its proper divisors (87411).

216429 is a wasteful number, since it uses less digits than its factorization.

216429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819.

The product of its digits is 864, while the sum is 24.

The square root of 216429 is about 465.2193031249. The cubic root of 216429 is about 60.0396959536.

The spelling of 216429 in words is "two hundred sixteen thousand, four hundred twenty-nine".