163906 has 4 divisors (see below), whose sum is σ = 245862. Its totient is φ = 81952.

The previous prime is 163901. The next prime is 163909. The reversal of 163906 is 609361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 11025 = 391^2 + 105^2 .

It is not an unprimeable number, because it can be changed into a prime (163901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40975 + ... + 40978.

2¹⁶³⁹⁰⁶ is an apocalyptic number.

163906 is a deficient number, since it is larger than the sum of its proper divisors (81956).

163906 is an equidigital number, since it uses as much as digits as its factorization.

163906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81955.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 163906 is about 404.8530597637. The cubic root of 163906 is about 54.7265768602.

The spelling of 163906 in words is "one hundred sixty-three thousand, nine hundred six".