169729423 has 4 divisors (see below), whose sum is σ = 169757568. Its totient is φ = 169701280.

The previous prime is 169729421. The next prime is 169729429. The reversal of 169729423 is 324927961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324927961 = 811 ⋅400651.

It is a cyclic number.

It is not a de Polignac number, because 169729423 - 2¹ = 169729421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 169729423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169729421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943 + ... + 18448.

It is an arithmetic number, because the mean of its divisors is an integer number (42439392).

Almost surely, 2^169729423 is an apocalyptic number.

169729423 is a deficient number, since it is larger than the sum of its proper divisors (28145).

169729423 is an equidigital number, since it uses as much as digits as its factorization.

169729423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28144.

The product of its digits is 163296, while the sum is 43.

The square root of 169729423 is about 13028.0245240789. The cubic root of 169729423 is about 553.6717668422.

The spelling of 169729423 in words is "one hundred sixty-nine million, seven hundred twenty-nine thousand, four hundred twenty-three".