164869 has 4 divisors (see below), whose sum is σ = 165996. Its totient is φ = 163744.

The previous prime is 164839. The next prime is 164881. The reversal of 164869 is 968461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 50625 = 338^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 164869 - 2⁵ = 164837 is a prime.

It is a super-2 number, since 2×164869² = 54363574322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304 + ... + 649.

It is an arithmetic number, because the mean of its divisors is an integer number (41499).

2¹⁶⁴⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

164869 is a deficient number, since it is larger than the sum of its proper divisors (1127).

164869 is an equidigital number, since it uses as much as digits as its factorization.

164869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126.

The product of its digits is 10368, while the sum is 34.

The square root of 164869 is about 406.0406383603. The cubic root of 164869 is about 54.8335463346.

The spelling of 164869 in words is "one hundred sixty-four thousand, eight hundred sixty-nine".