166839 has 8 divisors (see below), whose sum is σ = 234240. Its totient is φ = 105336.

The previous prime is 166823. The next prime is 166841. The reversal of 166839 is 938661.

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

It is not a de Polignac number, because 166839 - 2⁴ = 166823 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

166839 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166849) 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 in 7 ways as a sum of consecutive naturals, for example, 1407 + ... + 1520.

It is an arithmetic number, because the mean of its divisors is an integer number (29280).

2¹⁶⁶⁸³⁹ is an apocalyptic number.

166839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

166839 is a deficient number, since it is larger than the sum of its proper divisors (67401).

166839 is a wasteful number, since it uses less digits than its factorization.

166839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949.

The product of its digits is 7776, while the sum is 33.

The square root of 166839 is about 408.4593002981. The cubic root of 166839 is about 55.0510820188.

The spelling of 166839 in words is "one hundred sixty-six thousand, eight hundred thirty-nine".