19689907 has 2 divisors, whose sum is σ = 19689908. Its totient is φ = 19689906.

The previous prime is 19689889. The next prime is 19689913. The reversal of 19689907 is 70998691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19689907 is a prime.

It is not a weakly prime, because it can be changed into another prime (19689937) 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, 9844953 + 9844954.

It is an arithmetic number, because the mean of its divisors is an integer number (9844954).

Almost surely, 2^19689907 is an apocalyptic number.

19689907 is a deficient number, since it is larger than the sum of its proper divisors (1).

19689907 is an equidigital number, since it uses as much as digits as its factorization.

19689907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19689907 is about 4437.3310672070. The cubic root of 19689907 is about 270.0315783824.

The spelling of 19689907 in words is "nineteen million, six hundred eighty-nine thousand, nine hundred seven".