163639 has 8 divisors (see below), whose sum is σ = 189728. Its totient is φ = 138240.

The previous prime is 163637. The next prime is 163643. The reversal of 163639 is 936361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163639 - 2¹ = 163637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163633) 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 7 ways as a sum of consecutive naturals, for example, 559 + ... + 799.

It is an arithmetic number, because the mean of its divisors is an integer number (23716).

2¹⁶³⁶³⁹ is an apocalyptic number.

163639 is a deficient number, since it is larger than the sum of its proper divisors (26089).

163639 is an equidigital number, since it uses as much as digits as its factorization.

163639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its digits is 2916, while the sum is 28.

The square root of 163639 is about 404.5231760975. The cubic root of 163639 is about 54.6968444984.

It can be divided in two parts, 16 and 3639, that added together give a triangular number (3655 = T₈₅).

The spelling of 163639 in words is "one hundred sixty-three thousand, six hundred thirty-nine".