163406 has 4 divisors (see below), whose sum is σ = 245112. Its totient is φ = 81702.

The previous prime is 163403. The next prime is 163409. The reversal of 163406 is 604361.

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

It is an interprime number because it is at equal distance from previous prime (163403) and next prime (163409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163403) by changing a digit.

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 as a sum of consecutive naturals, namely, 40850 + ... + 40853.

It is an arithmetic number, because the mean of its divisors is an integer number (61278).

2¹⁶³⁴⁰⁶ is an apocalyptic number.

163406 is a deficient number, since it is larger than the sum of its proper divisors (81706).

163406 is an equidigital number, since it uses as much as digits as its factorization.

163406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81705.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 163406 is about 404.2350801205. The cubic root of 163406 is about 54.6708718426.

Adding to 163406 its reverse (604361), we get a palindrome (767767).

The spelling of 163406 in words is "one hundred sixty-three thousand, four hundred six".