19885499 has 2 divisors, whose sum is σ = 19885500. Its totient is φ = 19885498.

The previous prime is 19885483. The next prime is 19885507. The reversal of 19885499 is 99458891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19885499 - 2⁴ = 19885483 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19885499.

It is not a weakly prime, because it can be changed into another prime (19885429) 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, 9942749 + 9942750.

It is an arithmetic number, because the mean of its divisors is an integer number (9942750).

Almost surely, 2^19885499 is an apocalyptic number.

19885499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19885499 is an equidigital number, since it uses as much as digits as its factorization.

19885499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 53.

The square root of 19885499 is about 4459.3159789367. The cubic root of 19885499 is about 270.9227640809.

The spelling of 19885499 in words is "nineteen million, eight hundred eighty-five thousand, four hundred ninety-nine".