19729663 has 2 divisors, whose sum is σ = 19729664. Its totient is φ = 19729662.

The previous prime is 19729649. The next prime is 19729669. The reversal of 19729663 is 36692791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19729663 - 2⁵ = 19729631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19729669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9864831 + 9864832.

It is an arithmetic number, because the mean of its divisors is an integer number (9864832).

Almost surely, 2^19729663 is an apocalyptic number.

19729663 is a deficient number, since it is larger than the sum of its proper divisors (1).

19729663 is an equidigital number, since it uses as much as digits as its factorization.

19729663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 19729663 is about 4441.8085280660. The cubic root of 19729663 is about 270.2131969521.

The spelling of 19729663 in words is "nineteen million, seven hundred twenty-nine thousand, six hundred sixty-three".