19998029 has 2 divisors, whose sum is σ = 19998030. Its totient is φ = 19998028.

The previous prime is 19997993. The next prime is 19998031. The reversal of 19998029 is 92089991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18472804 + 1525225 = 4298^2 + 1235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19998029 is a prime.

It is a Sophie Germain prime.

Together with 19998031, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19998229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999014 + 9999015.

It is an arithmetic number, because the mean of its divisors is an integer number (9999015).

Almost surely, 2^19998029 is an apocalyptic number.

It is an amenable number.

19998029 is a deficient number, since it is larger than the sum of its proper divisors (1).

19998029 is an equidigital number, since it uses as much as digits as its factorization.

19998029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 19998029 is about 4471.9155850709. The cubic root of 19998029 is about 271.4328445047.

The spelling of 19998029 in words is "nineteen million, nine hundred ninety-eight thousand, twenty-nine".