169942369 has 4 divisors (see below), whose sum is σ = 174535444. Its totient is φ = 165349296.

The previous prime is 169942309. The next prime is 169942379. The reversal of 169942369 is 963249961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94478400 + 75463969 = 9720^2 + 8687^2 .

It is a cyclic number.

It is not a de Polignac number, because 169942369 - 2¹¹ = 169940321 is a prime.

It is a super-2 number, since 2×169942369² = 57760817562664322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169942309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2296482 + ... + 2296555.

It is an arithmetic number, because the mean of its divisors is an integer number (43633861).

Almost surely, 2^169942369 is an apocalyptic number.

It is an amenable number.

169942369 is a deficient number, since it is larger than the sum of its proper divisors (4593075).

169942369 is an equidigital number, since it uses as much as digits as its factorization.

169942369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593074.

The product of its digits is 629856, while the sum is 49.

The square root of 169942369 is about 13036.1945751051. The cubic root of 169942369 is about 553.9032193758.

The spelling of 169942369 in words is "one hundred sixty-nine million, nine hundred forty-two thousand, three hundred sixty-nine".