216699 has 16 divisors (see below), whose sum is σ = 350208. Its totient is φ = 116352.

The previous prime is 216679. The next prime is 216703. The reversal of 216699 is 996612.

It is a happy number.

It is not a de Polignac number, because 216699 - 2⁷ = 216571 is a prime.

216699 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216699.

It is not an unprimeable number, because it can be changed into a prime (216649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54 + ... + 660.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2²¹⁶⁶⁹⁹ is an apocalyptic number.

216699 is a deficient number, since it is larger than the sum of its proper divisors (133509).

216699 is a wasteful number, since it uses less digits than its factorization.

216699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its digits is 5832, while the sum is 33.

The square root of 216699 is about 465.5093984014. The cubic root of 216699 is about 60.0646525314.

The spelling of 216699 in words is "two hundred sixteen thousand, six hundred ninety-nine".