166439 has 16 divisors (see below), whose sum is σ = 215040. Its totient is φ = 125280.

The previous prime is 166429. The next prime is 166457. The reversal of 166439 is 934661.

It is a cyclic number.

It is not a de Polignac number, because 166439 - 2⁸ = 166183 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam 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 (166409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2792 + ... + 2850.

It is an arithmetic number, because the mean of its divisors is an integer number (13440).

166439 is a Friedman number, since it can be written as 64+(9*6+1)^3, using all its digits and the basic arithmetic operations.

2¹⁶⁶⁴³⁹ is an apocalyptic number.

166439 is a deficient number, since it is larger than the sum of its proper divisors (48601).

166439 is a wasteful number, since it uses less digits than its factorization.

166439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110.

The product of its digits is 3888, while the sum is 29.

The square root of 166439 is about 407.9693615947. The cubic root of 166439 is about 55.0070514375.

The spelling of 166439 in words is "one hundred sixty-six thousand, four hundred thirty-nine".