173409 has 4 divisors (see below), whose sum is σ = 231216. Its totient is φ = 115604.

The previous prime is 173359. The next prime is 173429. The reversal of 173409 is 904371.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 173409 - 2¹² = 169313 is a prime.

It is a D-number.

173409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (173429) 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, 28899 + ... + 28904.

It is an arithmetic number, because the mean of its divisors is an integer number (57804).

2¹⁷³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

173409 is a deficient number, since it is larger than the sum of its proper divisors (57807).

173409 is an equidigital number, since it uses as much as digits as its factorization.

173409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57806.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 173409 is about 416.4240627053. The cubic root of 173409 is about 55.7644227935.

The spelling of 173409 in words is "one hundred seventy-three thousand, four hundred nine".