19722473 has 2 divisors, whose sum is σ = 19722474. Its totient is φ = 19722472.

The previous prime is 19722467. The next prime is 19722487. The reversal of 19722473 is 37422791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14115049 + 5607424 = 3757^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 19722473 - 2⁴ = 19722457 is a prime.

It is not a weakly prime, because it can be changed into another prime (19722403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9861236 + 9861237.

It is an arithmetic number, because the mean of its divisors is an integer number (9861237).

Almost surely, 2^19722473 is an apocalyptic number.

It is an amenable number.

19722473 is a deficient number, since it is larger than the sum of its proper divisors (1).

19722473 is an equidigital number, since it uses as much as digits as its factorization.

19722473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 19722473 is about 4440.9990993019. Note that the first 3 decimals coincide. The cubic root of 19722473 is about 270.1803687357.

The spelling of 19722473 in words is "nineteen million, seven hundred twenty-two thousand, four hundred seventy-three".