109818 has 12 divisors (see below), whose sum is σ = 237978. Its totient is φ = 36600.

The previous prime is 109807. The next prime is 109819. The reversal of 109818 is 818901.

It can be written as a sum of positive squares in only one way, i.e., 88209 + 21609 = 297^2 + 147^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 109791 and 109800.

It is not an unprimeable number, because it can be changed into a prime (109819) 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, 3033 + ... + 3068.

2¹⁰⁹⁸¹⁸ is an apocalyptic number.

109818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

109818 is an abundant number, since it is smaller than the sum of its proper divisors (128160).

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

109818 is a wasteful number, since it uses less digits than its factorization.

109818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6109 (or 6106 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 109818 is about 331.3879901264. The cubic root of 109818 is about 47.8877585767.

The spelling of 109818 in words is "one hundred nine thousand, eight hundred eighteen".