19920799 has 2 divisors, whose sum is σ = 19920800. Its totient is φ = 19920798.

The previous prime is 19920757. The next prime is 19920827. The reversal of 19920799 is 99702991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19920799 - 2⁷ = 19920671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19920749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960399 + 9960400.

It is an arithmetic number, because the mean of its divisors is an integer number (9960400).

Almost surely, 2^19920799 is an apocalyptic number.

19920799 is a deficient number, since it is larger than the sum of its proper divisors (1).

19920799 is an equidigital number, since it uses as much as digits as its factorization.

19920799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 19920799 is about 4463.2722301020. The cubic root of 19920799 is about 271.0829799947.

The spelling of 19920799 in words is "nineteen million, nine hundred twenty thousand, seven hundred ninety-nine".