163818 has 24 divisors (see below), whose sum is σ = 374400. Its totient is φ = 51624.

The previous prime is 163811. The next prime is 163819. The reversal of 163818 is 818361.

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 = 163791 and 163800.

It is not an unprimeable number, because it can be changed into a prime (163811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (15600).

2¹⁶³⁸¹⁸ is an apocalyptic number.

163818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 163818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187200).

163818 is an abundant number, since it is smaller than the sum of its proper divisors (210582).

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

163818 is a wasteful number, since it uses less digits than its factorization.

163818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 503 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 163818 is about 404.7443637656. The cubic root of 163818 is about 54.7167809997.

The spelling of 163818 in words is "one hundred sixty-three thousand, eight hundred eighteen".