166939 has 4 divisors (see below), whose sum is σ = 168280. Its totient is φ = 165600.

The previous prime is 166931. The next prime is 166949. The reversal of 166939 is 939661.

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

It is a cyclic number.

It is not a de Polignac number, because 166939 - 2³ = 166931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (42070).

2¹⁶⁶⁹³⁹ is an apocalyptic number.

166939 is a deficient number, since it is larger than the sum of its proper divisors (1341).

166939 is a wasteful number, since it uses less digits than its factorization.

166939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its digits is 8748, while the sum is 34.

The square root of 166939 is about 408.5816931778. The cubic root of 166939 is about 55.0620786656.

The spelling of 166939 in words is "one hundred sixty-six thousand, nine hundred thirty-nine".