19640633 has 2 divisors, whose sum is σ = 19640634. Its totient is φ = 19640632.

The previous prime is 19640603. The next prime is 19640651. The reversal of 19640633 is 33604691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15904144 + 3736489 = 3988^2 + 1933^2 .

It is an emirp because it is prime and its reverse (33604691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19640633 - 2¹⁶ = 19575097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19640633.

It is not a weakly prime, because it can be changed into another prime (19640603) 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, 9820316 + 9820317.

It is an arithmetic number, because the mean of its divisors is an integer number (9820317).

Almost surely, 2^19640633 is an apocalyptic number.

It is an amenable number.

19640633 is a deficient number, since it is larger than the sum of its proper divisors (1).

19640633 is an equidigital number, since it uses as much as digits as its factorization.

19640633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 19640633 is about 4431.7753778819. The cubic root of 19640633 is about 269.8061388466.

The spelling of 19640633 in words is "nineteen million, six hundred forty thousand, six hundred thirty-three".