216693 has 6 divisors (see below), whose sum is σ = 313014. Its totient is φ = 144456.

The previous prime is 216679. The next prime is 216703. The reversal of 216693 is 396612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 3249 = 462^2 + 57^2 .

It is not a de Polignac number, because 216693 - 2⁵ = 216661 is a prime.

216693 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216653) 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, 12030 + ... + 12047.

It is an arithmetic number, because the mean of its divisors is an integer number (52169).

2²¹⁶⁶⁹³ is an apocalyptic number.

It is an amenable number.

216693 is a deficient number, since it is larger than the sum of its proper divisors (96321).

216693 is a wasteful number, since it uses less digits than its factorization.

216693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24083 (or 24080 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 216693 is about 465.5029538037. The cubic root of 216693 is about 60.0640981660.

It can be divided in two parts, 216 and 693, that added together give a palindrome (909).

The spelling of 216693 in words is "two hundred sixteen thousand, six hundred ninety-three".