169740809 has 8 divisors (see below), whose sum is σ = 194103360. Its totient is φ = 145406736.

The previous prime is 169740797. The next prime is 169740827. The reversal of 169740809 is 908047961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 169740809 - 2⁸ = 169740553 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 169740809.

It is not an unprimeable number, because it can be changed into a prime (169740899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7727 + ... + 19979.

It is an arithmetic number, because the mean of its divisors is an integer number (24262920).

Almost surely, 2^169740809 is an apocalyptic number.

It is an amenable number.

169740809 is a deficient number, since it is larger than the sum of its proper divisors (24362551).

169740809 is a wasteful number, since it uses less digits than its factorization.

169740809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14239.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 169740809 is about 13028.4614978132. The cubic root of 169740809 is about 553.6841472645.

The spelling of 169740809 in words is "one hundred sixty-nine million, seven hundred forty thousand, eight hundred nine".