19770899 has 2 divisors, whose sum is σ = 19770900. Its totient is φ = 19770898.

The previous prime is 19770889. The next prime is 19770937. The reversal of 19770899 is 99807791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19770899 - 2²⁰ = 18722323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19770859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9885449 + 9885450.

It is an arithmetic number, because the mean of its divisors is an integer number (9885450).

Almost surely, 2^19770899 is an apocalyptic number.

19770899 is a deficient number, since it is larger than the sum of its proper divisors (1).

19770899 is an equidigital number, since it uses as much as digits as its factorization.

19770899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 19770899 is about 4446.4479081622. The cubic root of 19770899 is about 270.4013190636.

The spelling of 19770899 in words is "nineteen million, seven hundred seventy thousand, eight hundred ninety-nine".