109218 has 16 divisors (see below), whose sum is σ = 221760. Its totient is φ = 35856.

The previous prime is 109211. The next prime is 109229. The reversal of 109218 is 812901.

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

It is a Curzon number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 109194 and 109203.

It is not an unprimeable number, because it can be changed into a prime (109211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571 + ... + 737.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2¹⁰⁹²¹⁸ is an apocalyptic number.

109218 is an abundant number, since it is smaller than the sum of its proper divisors (112542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

109218 is a wasteful number, since it uses less digits than its factorization.

109218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 109218 is about 330.4814669539. The cubic root of 109218 is about 47.8003863113.

The spelling of 109218 in words is "one hundred nine thousand, two hundred eighteen".