19995953 has 2 divisors, whose sum is σ = 19995954. Its totient is φ = 19995952.

The previous prime is 19995929. The next prime is 19995959. The reversal of 19995953 is 35959991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 4566769 = 3928^2 + 2137^2 .

It is an emirp because it is prime and its reverse (35959991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19995953 - 2⁶ = 19995889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19995959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997976 + 9997977.

It is an arithmetic number, because the mean of its divisors is an integer number (9997977).

Almost surely, 2^19995953 is an apocalyptic number.

It is an amenable number.

19995953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19995953 is an equidigital number, since it uses as much as digits as its factorization.

19995953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 492075, while the sum is 50.

The square root of 19995953 is about 4471.6834637528. The cubic root of 19995953 is about 271.4234516776.

The spelling of 19995953 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred fifty-three".