19742663 has 2 divisors, whose sum is σ = 19742664. Its totient is φ = 19742662.

The previous prime is 19742641. The next prime is 19742687. The reversal of 19742663 is 36624791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19742663 - 2⁶ = 19742599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19742693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9871331 + 9871332.

It is an arithmetic number, because the mean of its divisors is an integer number (9871332).

Almost surely, 2^19742663 is an apocalyptic number.

19742663 is a deficient number, since it is larger than the sum of its proper divisors (1).

19742663 is an equidigital number, since it uses as much as digits as its factorization.

19742663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 19742663 is about 4443.2716549858. The cubic root of 19742663 is about 270.2725323179.

The spelling of 19742663 in words is "nineteen million, seven hundred forty-two thousand, six hundred sixty-three".