164138305 has 4 divisors (see below), whose sum is σ = 196965972. Its totient is φ = 131310640.

The previous prime is 164138257. The next prime is 164138309. The reversal of 164138305 is 503831461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66977856 + 97160449 = 8184^2 + 9857^2 .

It is not a de Polignac number, because 164138305 - 2⁹ = 164137793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164138309) 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 3 ways as a sum of consecutive naturals, for example, 16413826 + ... + 16413835.

It is an arithmetic number, because the mean of its divisors is an integer number (49241493).

Almost surely, 2^164138305 is an apocalyptic number.

It is an amenable number.

164138305 is a deficient number, since it is larger than the sum of its proper divisors (32827667).

164138305 is an equidigital number, since it uses as much as digits as its factorization.

164138305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32827666.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 164138305 is about 12811.6472399142. The cubic root of 164138305 is about 547.5241942840.

Adding to 164138305 its reverse (503831461), we get a palindrome (667969766).

The spelling of 164138305 in words is "one hundred sixty-four million, one hundred thirty-eight thousand, three hundred five".