19920499 has 2 divisors, whose sum is σ = 19920500. Its totient is φ = 19920498.

The previous prime is 19920491. The next prime is 19920521. The reversal of 19920499 is 99402991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19920499 - 2³ = 19920491 is a prime.

It is not a weakly prime, because it can be changed into another prime (19920491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960249 + 9960250.

It is an arithmetic number, because the mean of its divisors is an integer number (9960250).

Almost surely, 2^19920499 is an apocalyptic number.

19920499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19920499 is an equidigital number, since it uses as much as digits as its factorization.

19920499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 19920499 is about 4463.2386223459. The cubic root of 19920499 is about 271.0816191841.

The spelling of 19920499 in words is "nineteen million, nine hundred twenty thousand, four hundred ninety-nine".