19573 has 6 divisors (see below), whose sum is σ = 21014. Its totient is φ = 18216.

The previous prime is 19571. The next prime is 19577. The reversal of 19573 is 37591.

It can be written as a sum of positive squares in only one way, i.e., 19044 + 529 = 138^2 + 23^2 .

It is not a de Polignac number, because 19573 - 2¹ = 19571 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 511 + ... + 547.

2¹⁹⁵⁷³ is an apocalyptic number.

It is an amenable number.

19573 is a deficient number, since it is larger than the sum of its proper divisors (1441).

19573 is an equidigital number, since it uses as much as digits as its factorization.

19573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 60 counting only the distinct ones).

The product of its digits is 945, while the sum is 25.

The square root of 19573 is about 139.9035381969. The cubic root of 19573 is about 26.9496088006.

The spelling of 19573 in words is "nineteen thousand, five hundred seventy-three".