216407 has 6 divisors (see below), whose sum is σ = 228168. Its totient is φ = 204864.

The previous prime is 216401. The next prime is 216421. The reversal of 216407 is 704612.

It is not a de Polignac number, because 216407 - 2¹⁴ = 200023 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 (216401) 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 5 ways as a sum of consecutive naturals, for example, 2183 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (38028).

2²¹⁶⁴⁰⁷ is an apocalyptic number.

216407 is a deficient number, since it is larger than the sum of its proper divisors (11761).

216407 is an frugal number, since it uses more digits than its factorization.

216407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 216407 is about 465.1956577613. The cubic root of 216407 is about 60.0376615404.

The spelling of 216407 in words is "two hundred sixteen thousand, four hundred seven".