164639 has 4 divisors (see below), whose sum is σ = 167400. Its totient is φ = 161880.

The previous prime is 164627. The next prime is 164653. The reversal of 164639 is 936461.

164639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936461 = 919 ⋅1019.

It is a cyclic number.

It is not a de Polignac number, because 164639 - 2⁴ = 164623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164039) 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, 1289 + ... + 1410.

It is an arithmetic number, because the mean of its divisors is an integer number (41850).

2¹⁶⁴⁶³⁹ is an apocalyptic number.

164639 is a deficient number, since it is larger than the sum of its proper divisors (2761).

164639 is an equidigital number, since it uses as much as digits as its factorization.

164639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760.

The product of its digits is 3888, while the sum is 29.

The square root of 164639 is about 405.7573166315. The cubic root of 164639 is about 54.8080360105.

The spelling of 164639 in words is "one hundred sixty-four thousand, six hundred thirty-nine".