19724093 has 2 divisors, whose sum is σ = 19724094. Its totient is φ = 19724092.

The previous prime is 19724039. The next prime is 19724099. The reversal of 19724093 is 39042791.

Together with previous prime (19724039) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16345849 + 3378244 = 4043^2 + 1838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19724093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19724099) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9862046 + 9862047.

It is an arithmetic number, because the mean of its divisors is an integer number (9862047).

Almost surely, 2^19724093 is an apocalyptic number.

It is an amenable number.

19724093 is a deficient number, since it is larger than the sum of its proper divisors (1).

19724093 is an equidigital number, since it uses as much as digits as its factorization.

19724093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 19724093 is about 4441.1814869469. The cubic root of 19724093 is about 270.1877660537.

The spelling of 19724093 in words is "nineteen million, seven hundred twenty-four thousand, ninety-three".