19885297 has 2 divisors, whose sum is σ = 19885298. Its totient is φ = 19885296.

The previous prime is 19885259. The next prime is 19885303. The reversal of 19885297 is 79258891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 136161 = 4444^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 19885297 - 2²³ = 11496689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19885297.

It is not a weakly prime, because it can be changed into another prime (19885237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9942648 + 9942649.

It is an arithmetic number, because the mean of its divisors is an integer number (9942649).

Almost surely, 2^19885297 is an apocalyptic number.

It is an amenable number.

19885297 is a deficient number, since it is larger than the sum of its proper divisors (1).

19885297 is an equidigital number, since it uses as much as digits as its factorization.

19885297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 19885297 is about 4459.2933296656. The cubic root of 19885297 is about 270.9218467193.

The spelling of 19885297 in words is "nineteen million, eight hundred eighty-five thousand, two hundred ninety-seven".