164643 has 4 divisors (see below), whose sum is σ = 219528. Its totient is φ = 109760.

The previous prime is 164627. The next prime is 164653. The reversal of 164643 is 346461.

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 164643 - 2⁴ = 164627 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (164623) 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, 27438 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (54882).

2¹⁶⁴⁶⁴³ is an apocalyptic number.

164643 is a deficient number, since it is larger than the sum of its proper divisors (54885).

164643 is an equidigital number, since it uses as much as digits as its factorization.

164643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54884.

The product of its digits is 1728, while the sum is 24.

The square root of 164643 is about 405.7622456562. The cubic root of 164643 is about 54.8084798713.

The spelling of 164643 in words is "one hundred sixty-four thousand, six hundred forty-three".