19872973 has 4 divisors (see below), whose sum is σ = 19897020. Its totient is φ = 19848928.

The previous prime is 19872961. The next prime is 19872991. The reversal of 19872973 is 37927891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37927891 = 787 ⋅48193.

It can be written as a sum of positive squares in 2 ways, for example, as 15194404 + 4678569 = 3898^2 + 2163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19872973 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 (19872173) 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, 10738 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (4974255).

Almost surely, 2^19872973 is an apocalyptic number.

It is an amenable number.

19872973 is a deficient number, since it is larger than the sum of its proper divisors (24047).

19872973 is an equidigital number, since it uses as much as digits as its factorization.

19872973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24046.

The product of its digits is 190512, while the sum is 46.

The square root of 19872973 is about 4457.9112822038. The cubic root of 19872973 is about 270.8658668190.

The spelling of 19872973 in words is "nineteen million, eight hundred seventy-two thousand, nine hundred seventy-three".