19742123 has 2 divisors, whose sum is σ = 19742124. Its totient is φ = 19742122.

The previous prime is 19742077. The next prime is 19742141. The reversal of 19742123 is 32124791.

It is a strong prime.

It is an emirp because it is prime and its reverse (32124791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19742123 - 2⁶ = 19742059 is a prime.

It is not a weakly prime, because it can be changed into another prime (19742143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9871061 + 9871062.

It is an arithmetic number, because the mean of its divisors is an integer number (9871062).

Almost surely, 2^19742123 is an apocalyptic number.

19742123 is a deficient number, since it is larger than the sum of its proper divisors (1).

19742123 is an equidigital number, since it uses as much as digits as its factorization.

19742123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 19742123 is about 4443.2108885355. The cubic root of 19742123 is about 270.2700681367.

The spelling of 19742123 in words is "nineteen million, seven hundred forty-two thousand, one hundred twenty-three".