163506 has 32 divisors (see below), whose sum is σ = 397440. Its totient is φ = 43776.

The previous prime is 163487. The next prime is 163517. The reversal of 163506 is 605361.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

163506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 600 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (12420).

2¹⁶³⁵⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198720).

163506 is an abundant number, since it is smaller than the sum of its proper divisors (233934).

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

163506 is a wasteful number, since it uses less digits than its factorization.

163506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 163506 is about 404.3587516056. The cubic root of 163506 is about 54.6820219275.

Adding to 163506 its reverse (605361), we get a palindrome (768867).

The spelling of 163506 in words is "one hundred sixty-three thousand, five hundred six".