163816 has 8 divisors (see below), whose sum is σ = 307170. Its totient is φ = 81904.

The previous prime is 163811. The next prime is 163819. The reversal of 163816 is 618361.

It can be written as a sum of positive squares in only one way, i.e., 119716 + 44100 = 346^2 + 210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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

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

163816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10231 + ... + 10246.

2¹⁶³⁸¹⁶ is an apocalyptic number.

It is an amenable number.

163816 is a deficient number, since it is larger than the sum of its proper divisors (143354).

163816 is a wasteful number, since it uses less digits than its factorization.

163816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20483 (or 20479 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 163816 is about 404.7418930627. The cubic root of 163816 is about 54.7165583258.

It can be divided in two parts, 163 and 816, that added together give a palindrome (979).

The spelling of 163816 in words is "one hundred sixty-three thousand, eight hundred sixteen".