19728973 has 8 divisors (see below), whose sum is σ = 22655520. Its totient is φ = 16991280.

The previous prime is 19728967. The next prime is 19728979. The reversal of 19728973 is 37982791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19728967) and next prime (19728979).

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 19728973 - 2¹³ = 19720781 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 (19728979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46990 + ... + 47407.

It is an arithmetic number, because the mean of its divisors is an integer number (2831940).

Almost surely, 2^19728973 is an apocalyptic number.

It is an amenable number.

19728973 is a deficient number, since it is larger than the sum of its proper divisors (2926547).

19728973 is a wasteful number, since it uses less digits than its factorization.

19728973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94427.

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

The square root of 19728973 is about 4441.7308563217. The cubic root of 19728973 is about 270.2100468851.

The spelling of 19728973 in words is "nineteen million, seven hundred twenty-eight thousand, nine hundred seventy-three".