164939 has 4 divisors (see below), whose sum is σ = 173640. Its totient is φ = 156240.

The previous prime is 164911. The next prime is 164953. The reversal of 164939 is 939461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939461 = 61 ⋅15401.

It is a cyclic number.

It is not a de Polignac number, because 164939 - 2⁸ = 164683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4322 + ... + 4359.

It is an arithmetic number, because the mean of its divisors is an integer number (43410).

2¹⁶⁴⁹³⁹ is an apocalyptic number.

164939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

164939 is a deficient number, since it is larger than the sum of its proper divisors (8701).

164939 is an equidigital number, since it uses as much as digits as its factorization.

164939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8700.

The product of its digits is 5832, while the sum is 32.

The square root of 164939 is about 406.1268274813. The cubic root of 164939 is about 54.8413056367.

The spelling of 164939 in words is "one hundred sixty-four thousand, nine hundred thirty-nine".