216903 has 8 divisors (see below), whose sum is σ = 306288. Its totient is φ = 136064.

The previous prime is 216901. The next prime is 216911. The reversal of 216903 is 309612.

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

It is a cyclic number.

It is not a de Polignac number, because 216903 - 2¹ = 216901 is a prime.

It is a super-2 number, since 2×216903² = 94093822818, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 216903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216901) 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, 2076 + ... + 2177.

It is an arithmetic number, because the mean of its divisors is an integer number (38286).

2²¹⁶⁹⁰³ is an apocalyptic number.

216903 is a deficient number, since it is larger than the sum of its proper divisors (89385).

216903 is a wasteful number, since it uses less digits than its factorization.

216903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 216903 is about 465.7284616598. The cubic root of 216903 is about 60.0834948673.

The spelling of 216903 in words is "two hundred sixteen thousand, nine hundred three".