173921 has 8 divisors (see below), whose sum is σ = 192864. Its totient is φ = 155520.

The previous prime is 173917. The next prime is 173923. The reversal of 173921 is 129371.

173921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 173921 - 2² = 173917 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 173921.

It is not an unprimeable number, because it can be changed into a prime (173923) 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, 986 + ... + 1148.

It is an arithmetic number, because the mean of its divisors is an integer number (24108).

2¹⁷³⁹²¹ is an apocalyptic number.

173921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

173921 is a deficient number, since it is larger than the sum of its proper divisors (18943).

173921 is a wasteful number, since it uses less digits than its factorization.

173921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its digits is 378, while the sum is 23.

The square root of 173921 is about 417.0383675395. The cubic root of 173921 is about 55.8192514176.

The spelling of 173921 in words is "one hundred seventy-three thousand, nine hundred twenty-one".