19732973 has 4 divisors (see below), whose sum is σ = 21250908. Its totient is φ = 18215040.

The previous prime is 19732969. The next prime is 19733017. The reversal of 19732973 is 37923791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37923791 = 19 ⋅1995989.

It can be written as a sum of positive squares in 2 ways, for example, as 1087849 + 18645124 = 1043^2 + 4318^2 .

It is a cyclic number.

It is not a de Polignac number, because 19732973 - 2² = 19732969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19732973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19732913) 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, 758948 + ... + 758973.

It is an arithmetic number, because the mean of its divisors is an integer number (5312727).

Almost surely, 2^19732973 is an apocalyptic number.

19732973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19732973 is a deficient number, since it is larger than the sum of its proper divisors (1517935).

19732973 is a wasteful number, since it uses less digits than its factorization.

19732973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517934.

The product of its digits is 71442, while the sum is 41.

The square root of 19732973 is about 4442.1811084196. The cubic root of 19732973 is about 270.2283071218.

The spelling of 19732973 in words is "nineteen million, seven hundred thirty-two thousand, nine hundred seventy-three".