19630993 has 2 divisors, whose sum is σ = 19630994. Its totient is φ = 19630992.

The previous prime is 19630991. The next prime is 19631021. The reversal of 19630993 is 39903691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19509889 + 121104 = 4417^2 + 348^2 .

It is an emirp because it is prime and its reverse (39903691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19630993 - 2¹ = 19630991 is a prime.

Together with 19630991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19630991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9815496 + 9815497.

It is an arithmetic number, because the mean of its divisors is an integer number (9815497).

Almost surely, 2^19630993 is an apocalyptic number.

It is an amenable number.

19630993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19630993 is an equidigital number, since it uses as much as digits as its factorization.

19630993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 19630993 is about 4430.6876441474. The cubic root of 19630993 is about 269.7619896106.

The spelling of 19630993 in words is "nineteen million, six hundred thirty thousand, nine hundred ninety-three".