19992899 has 2 divisors, whose sum is σ = 19992900. Its totient is φ = 19992898.

The previous prime is 19992881. The next prime is 19992937. The reversal of 19992899 is 99829991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19992899 - 2¹² = 19988803 is a prime.

It is not a weakly prime, because it can be changed into another prime (19992809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996449 + 9996450.

It is an arithmetic number, because the mean of its divisors is an integer number (9996450).

Almost surely, 2^19992899 is an apocalyptic number.

19992899 is a deficient number, since it is larger than the sum of its proper divisors (1).

19992899 is an equidigital number, since it uses as much as digits as its factorization.

19992899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 56.

The square root of 19992899 is about 4471.3419685817. The cubic root of 19992899 is about 271.4096327242.

The spelling of 19992899 in words is "nineteen million, nine hundred ninety-two thousand, eight hundred ninety-nine".