19429717 has 2 divisors, whose sum is σ = 19429718. Its totient is φ = 19429716.

The previous prime is 19429667. The next prime is 19429727. The reversal of 19429717 is 71792491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 192721 = 4386^2 + 439^2 .

It is an emirp because it is prime and its reverse (71792491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19429717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19429717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19429727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9714858 + 9714859.

It is an arithmetic number, because the mean of its divisors is an integer number (9714859).

Almost surely, 2^19429717 is an apocalyptic number.

It is an amenable number.

19429717 is a deficient number, since it is larger than the sum of its proper divisors (1).

19429717 is an equidigital number, since it uses as much as digits as its factorization.

19429717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 40.

The square root of 19429717 is about 4407.9152668807. The cubic root of 19429717 is about 268.8368666734.

The spelling of 19429717 in words is "nineteen million, four hundred twenty-nine thousand, seven hundred seventeen".