173973 has 4 divisors (see below), whose sum is σ = 231968. Its totient is φ = 115980.

The previous prime is 173969. The next prime is 173977. The reversal of 173973 is 379371.

173973 is nontrivially palindromic in base 2.

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, and also an emirpimes, since its reverse is a distinct semiprime: 379371 = 3 ⋅126457.

It is an interprime number because it is at equal distance from previous prime (173969) and next prime (173977).

It is not a de Polignac number, because 173973 - 2² = 173969 is a prime.

It is a D-number.

It is a Duffinian number.

173973 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 173973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173977) 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, 28993 + ... + 28998.

It is an arithmetic number, because the mean of its divisors is an integer number (57992).

2¹⁷³⁹⁷³ is an apocalyptic number.

It is an amenable number.

173973 is a deficient number, since it is larger than the sum of its proper divisors (57995).

173973 is an equidigital number, since it uses as much as digits as its factorization.

173973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57994.

The product of its digits is 3969, while the sum is 30.

The square root of 173973 is about 417.1007072638. The cubic root of 173973 is about 55.8248139275.

The spelling of 173973 in words is "one hundred seventy-three thousand, nine hundred seventy-three".