169645 has 16 divisors (see below), whose sum is σ = 240768. Its totient is φ = 112320.

The previous prime is 169639. The next prime is 169649. The reversal of 169645 is 546961.

It is not a de Polignac number, because 169645 - 2¹¹ = 167597 is a prime.

It is a super-3 number, since 3×169645³ = 14646857184033375, which contains 333 as substring.

It is a Duffinian number.

Its product of digits (6480) is a multiple of the sum of its prime divisors (180).

169645 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1230 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (15048).

2¹⁶⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

169645 is a deficient number, since it is larger than the sum of its proper divisors (71123).

169645 is a wasteful number, since it uses less digits than its factorization.

169645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its digits is 6480, while the sum is 31.

The square root of 169645 is about 411.8798368457. The cubic root of 169645 is about 55.3579953290.

The spelling of 169645 in words is "one hundred sixty-nine thousand, six hundred forty-five".